My busy neighbor dropped this off when I was sick, and it is pure comfort food. Can’t believe it’s just 3 ingredients.

This Oven-Baked 3-Ingredient Chili Mac Casserole is the ultimate comfort-food shortcut, merging the savory, spiced depth of beef chili with the classic appeal of macaroni and cheese. By boiling the macaroni just shy of “al dente,” you allow the pasta to finish its cooking process inside the oven, where it acts like a sponge for the chili’s flavorful juices. The result is a hearty, unified dish with a thick, sharp cheddar crust that provides a salty, crispy contrast to the tender pasta beneath.

Oven Baked 3-Ingredients Chili Mac Casserole

Ingredients:

Step-by-Step Directions:

Step 1: The Par-Boil: Preheat your oven to 375°F. Bring a large pot of salted water to a boil and cook the macaroni for 1/2 minutes less than the package directions.

Tip: This is a vital “mechanical” step. If you cook the pasta to full tenderness on the stove, it will become mushy after 30/35 minutes in the oven. Keeping it firm ensures it holds its shape against the heavy chili and cheese.

Step 2: The Pot Mix: Return the drained macaroni to the warm pot. Stir in all the chili and 2 cups of the cheddar cheese until the mixture is glossy and the cheese begins to pull.

The Texture Rule: If the mixture looks too dry, add a small splash of water or beef broth. You want it “saucy” because the pasta will continue to absorb liquid as it bakes.

Step 3: The Even Layer: Pour the mixture into a 9×13-inch pan (a disposable foil pan works great for easy cleanup). Spread it to the corners and top with the remaining 1 cup of cheese.

Step 4: The Tented Bake: Cover the pan loosely with foil, tenting it so it doesn’t touch the cheese. Bake for 20 minutes.

Tip: Removing the foil for the final 10/15 minutes is essential for caramelization. You are looking for the cheese to not only melt but to develop those small, toasted brown spots that indicate a deep, nutty flavor.

Step 5: The Essential Rest: Remove from the oven and let it sit for 10 minutes before serving.

Tip: This rest allows the starches in the pasta to “bond” with the fats in the cheese and chili. Slicing in too early will result in the chili running to the bottom of the pan; waiting 10 minutes ensures a cohesive, scoopable meal.