Taco Spaghetti Casserole is an easy 6-serving dinner made with tender spaghetti, lean ground beef, onion, taco seasoning, diced tomatoes with green chiles, tomato sauce, sour cream, and plenty of melted cheese. The casserole takes about 15 minutes to prepare and 30–35 minutes to cook, making it a satisfying family meal in roughly 45–50 minutes.
Every forkful brings together the cozy texture of baked pasta and the bold flavor of taco night. The creamy tomato-beef sauce clings to the spaghetti, while the bubbling Mexican-blend cheese creates a golden topping that makes this casserole especially inviting straight from the oven.
Jump to RecipeWhy You’ll Love This Recipe
This casserole delivers the comfort of classic baked spaghetti with the savory, gently spicy character of taco-seasoned beef. It is familiar enough for children, yet flavorful enough to keep adults happy at the dinner table.
The recipe also uses practical grocery-store ingredients and one large skillet plus one baking dish. That makes it a smart choice for a weeknight when you want a hot, hearty meal without preparing several separate side dishes.
For another pasta dinner with a traditional tomato-and-beef profile, you can also try this one-pot spaghetti when you want to keep the meal on the stovetop.
Ingredients You’ll Need
The ingredient list is short, but each item has an important job in the finished casserole. Spaghetti provides the tender base, while ground beef and onion create a savory foundation for the taco-seasoned sauce.
- Spaghetti: Use 8 ounces of dry spaghetti and cook it slightly underdone so it holds its texture after baking.
- Ground beef and onion: One pound of lean ground beef and one small diced yellow onion bring richness and a gentle sweetness.
- Flavor builders: Two minced garlic cloves and one packet of taco seasoning supply savory depth and familiar taco flavor.
- Sauce ingredients: Undrained diced tomatoes with green chiles, tomato sauce, and water form the saucy tomato mixture.
- Creamy ingredients: One cup of sour cream softens the tomato and chile flavors and gives the pasta a creamy coating.
- Cheese: Two cups of shredded Mexican-blend cheese or cheddar are divided between the pasta mixture and the topping.
Season with salt and black pepper as needed, remembering that taco seasoning and cheese may already contain salt. Cilantro or sliced green onions are optional, but both add a fresh finish to the rich casserole.
How to Make It Step-by-Step
Step 1: Heat the oven to 375°F and lightly grease a 9-by-13-inch baking dish. Greasing the dish helps the saucy pasta release more easily when you serve it.
Step 2: Bring a pot of salted water to a boil and cook the spaghetti until it is just shy of al dente, usually 1–2 minutes less than the package directions. Drain it well, but do not rinse it, because a little surface starch helps the sauce cling to the strands.
Step 3: While the pasta cooks, brown the lean ground beef and diced onion in a large skillet over medium-high heat for about 6–8 minutes. Break the beef into small pieces as it cooks, and drain excess fat if necessary.
Step 4: Add the minced garlic to the skillet and cook for 30 seconds, just until fragrant. Stir in the taco seasoning, undrained diced tomatoes with green chiles, tomato sauce, and water, then let the mixture simmer for 5–7 minutes.
Step 5: Remove the skillet from the heat before stirring in the sour cream. Add the drained spaghetti and toss gently until the creamy beef sauce coats the noodles from edge to edge.
Step 6: Transfer the coated spaghetti mixture to the greased baking dish and spread it into an even layer. Sprinkle the remaining cheese over the top, covering the casserole so it melts into a generous golden blanket.
Step 7: Bake the casserole uncovered for 15–20 minutes, until it is hot and bubbling around the edges. Let it rest for 5 minutes before serving, then scatter cilantro or sliced green onions over the top if desired.
Pro Tips for the Best Casserole
The most important texture tip is to avoid fully cooking the spaghetti before it goes into the oven. Noodles that are already completely tender can become soft during the 15–20 minute bake, while slightly underdone pasta finishes at just the right consistency.
Keep the diced tomatoes with green chiles undrained. Their liquid joins the tomato sauce and water to create the moisture needed for a cohesive casserole, so draining the can can leave the finished pasta drier than intended.
For the smoothest, most attractive cheese topping, shred cheese from a block when possible. Pre-shredded cheese is convenient, but freshly shredded Mexican-blend cheese or cheddar often melts more evenly.
Do not stir the sour cream into the skillet while it is still over high heat. Removing the pan from the burner first helps the sour cream blend into the sauce smoothly without becoming grainy.
If you enjoy layered, cheesy baked dinners, this chicken casserole idea is another comforting option for your weekly menu.
Easy Serving Ideas
Because this dish includes pasta, beef, vegetables from the tomato mixture, and a creamy cheese topping, it can stand on its own as a complete dinner. Serve generous squares or spoonfuls while the cheese is still warm and stretchy.
A crisp green salad adds freshness and contrast, while sliced avocado, extra sour cream, or a small bowl of salsa can be placed on the table for optional toppings. Tortilla chips also provide a crunchy side that echoes the taco theme.
For a colorful finish, use cilantro for a bright herbal note or sliced green onions for a mild onion flavor. Add the garnish after the five-minute resting period so it stays fresh and vibrant.
When planning a casserole night, you might also enjoy this sauerkraut casserole for a tangy, hearty change of pace.
Storage and Reheating
Allow leftovers to cool before covering and refrigerating them. Store the casserole in an airtight container or cover the baking dish well, then enjoy refrigerated portions within a few days for the best texture and flavor.
Reheat individual servings in the microwave until hot, or warm a larger portion in the oven until heated through. If the pasta seems dry after refrigeration, a small spoonful of water can help restore moisture before reheating.
For a make-ahead dinner, assemble the mixture in the baking dish and refrigerate it until you are ready to bake. Since chilled food may need additional heating time, check that the center is hot and bubbling before serving.
Variations to Try
The basic version is creamy and balanced, but it can be adjusted to suit your family. Some published variations use 8 ounces of cream cheese instead of sour cream for a richer, thicker sauce.
Other versions omit the tomato sauce and use an additional can of tomatoes with green chiles or about 1 cup of salsa. Those changes create a slightly different sauce while keeping the taco-inspired profile.
Black beans, corn, sliced olives, or 1 cup of cooked rice may also be added, although they are not part of the basic recipe. If you add extra ingredients, keep the mixture evenly coated and avoid overcrowding the baking dish.
For another cheesy pasta dinner, take a look at this cheesy rigatoni skillet for inspiration.
Common Questions
Can I use cheddar instead of Mexican-blend cheese? Yes. The recipe calls for either shredded Mexican-blend cheese or cheddar, so choose the flavor your household prefers.
Why is the tomato can not drained? The liquid from the diced tomatoes with green chiles helps build the sauce alongside the tomato sauce and water. Keeping it in the skillet supports a moist, spoonable casserole.
Can I make this less spicy? The diced tomatoes with green chiles provide the chile flavor, so use a mild variety if available. You can also serve extra sour cream on the side to soften the heat at the table.
What should I do with extra casserole ideas? For a classic comfort-food side or potluck option, you can also browse this biscuits and gravy casserole when planning a larger spread.
Taco Spaghetti Casserole
Ingredients
Method
- Heat the oven to 375°F and lightly grease a 9-by-13-inch baking dish.
- Cook the spaghetti in salted water until it is just shy of al dente, usually 1–2 minutes less than the package directions. Drain well.
- Meanwhile, brown the lean ground beef and diced onion in a large skillet over medium-high heat for about 6–8 minutes. Drain excess fat if necessary.
- Add the minced garlic and cook for 30 seconds. Stir in the taco seasoning, undrained diced tomatoes with green chiles, tomato sauce, and water, then simmer for 5–7 minutes.
- Remove the skillet from the heat and stir in the sour cream. Add the cooked spaghetti and mix until every strand is coated.
- Transfer the spaghetti mixture to the prepared baking dish and spread it into an even layer. Sprinkle the remaining cheese over the top.
- Bake uncovered for 15–20 minutes, until hot and bubbling. Rest for 5 minutes, then garnish with cilantro or green onions if desired.
Notes
Final Thoughts
Taco Spaghetti Casserole is the kind of dinner that earns a regular place in the family rotation. It combines affordable ingredients, a straightforward method, and the irresistible comfort of bubbling cheese over saucy pasta.
Keep the spaghetti slightly underdone, leave the tomatoes undrained, and let the finished casserole rest for 5 minutes before serving. Those small details help produce a creamy, flavorful dish with noodles that stay pleasantly tender instead of mushy.
Prepare it for a busy weeknight, a casual potluck, or a relaxed weekend dinner, and finish each serving with cilantro or green onions. With its taco-seasoned beef, creamy sauce, and golden cheese topping, this 6-serving bake is built to bring everyone back for seconds.