Oven Baked 3-Ingredients Chili Mac Casserole

Prep Time: 5 minutes
Cook Time: 35 minutes
Total Time: 40 minutes
Servings: 6
Difficulty: ★☆☆☆☆ (Very Easy)

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Intensity Breakdown

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Why This Recipe Works

This is the ultimate “pantry is almost empty” dinner. With only three main ingredients—pasta, canned chili, and cheese—you create a creamy, spicy, deeply satisfying casserole that tastes like you simmered it for hours. The pasta cooks inside the chili sauce in the oven, absorbing all the flavor while the cheese melts into a golden, bubbly crust. No pre-cooking the pasta separately. No draining. No fuss.

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Ingredients

• 1 lb (450 g) elbow macaroni (or any small pasta like shells or cavatappi)

• 2 cans (15 oz / 425 g each) beef chili with beans (or turkey chili for a lighter option)

• 4 cups (400 g) shredded sharp cheddar cheese (divided)

*Optional add-ins (not counted in the “3 ingredients”):*

• ½ cup sour cream (for creamier texture)

• Pickled jalapeños for heat

• Chopped green onions for garnish

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Equipment Needed

• 9×13 inch (23×33 cm) baking dish or casserole dish

• Large pot (for boiling pasta)

• Colander

• Wooden spoon or silicone spatula

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Nutrition Information (per serving, approximately)

Based on 6 servings using lean beef chili with beans and sharp cheddar.

Note: Sodium content varies significantly by chili brand. For lower sodium, choose a “no salt added” canned chili or make your own.

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Dietary Swaps (Maintaining the 3-Ingredient Spirit)

• Gluten-Free: Use gluten-free elbow pasta. Most canned chili is gluten-free, but check the label.

• Lower Carb: Replace pasta with 4 cups of chopped cauliflower florets (adds 15 minutes to bake time).

• Vegetarian: Use canned vegetarian chili with beans.

• Dairy-Free: Use vegan shredded cheddar and a dairy-free canned chili (like Amy’s).

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Instructions

Step 1: Preheat and Prep

Preheat your oven to 375°F (190°C). Lightly grease your 9×13 inch baking dish with butter, oil, or non-stick spray.

Step 2: Cook the Pasta (Partial)

Bring a large pot of salted water to a rolling boil. Add the elbow macaroni and cook for exactly 5 minutes (half the package’s recommended time). The pasta will be firm and slightly underdone—this is critical because it will finish cooking in the oven. Drain the pasta in a colander. Do not rinse; you want the starch to help thicken the casserole.

Step 3: Layer the Base

Return the drained pasta to the pot (off the heat). Add both cans of chili (do not drain) and 3 cups of the shredded cheddar. Stir until the cheese begins to melt and everything is evenly combined. The mixture will look thick and gloopy—that’s perfect.

Step 4: Transfer to Baking Dish

Pour the pasta-chili-cheese mixture into your prepared baking dish. Spread it into an even layer with the back of your spoon.

Step 5: Top with Cheese

Sprinkle the remaining 1 cup of shredded cheddar evenly over the top. For an extra-crispy cheese crust, do not press it down.

Step 6: Bake (Uncovered)

Place the dish on the middle rack of your preheated oven. Bake uncovered for 25–30 minutes, or until:

• The edges are bubbling and dark brown.

• The top cheese is golden and slightly crisp.

• A knife inserted in the center comes out hot to the touch (careful!).

Step 7: Rest and Serve

Remove the casserole from the oven. Let it rest for 5 minutes on a cooling rack or trivet. This allows the starches to set so you get clean squares instead of a soupy mess. Garnish with optional green onions or jalapeños. Serve hot.

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The “Last of the Recipe” – Pro Tips for Perfection

Here are the final secrets to making this 3-ingredient wonder taste like a gourmet meal:

1. Don’t overcook the pasta initially. Five minutes is the magic number. If you cook it to al dente on the stove, the oven will turn it into mush.

2. Use full-fat cheese. Pre-shredded cheese works fine, but shredding from a block gives you better melt and no anti-caking agents. Sharp cheddar provides the most flavor punch with the fewest ingredients.

3. Customize without adding ingredients. Swirl in a spoonful of mustard or hot sauce into the pot before baking. Add a layer of crushed tortilla chips between the pasta and the top cheese for crunch.

4. Make it ahead. Assemble the casserole completely (without baking). Cover and refrigerate for up to 24 hours. When ready to bake, add 10–15 minutes to the cooking time because you’re starting from cold.

5. Freeze for later. Bake the casserole fully, cool completely, cover tightly with foil, and freeze for up to 3 months. Reheat in a 350°F oven for 30–40 minutes (still covered for the first 20 minutes).

6. Leftovers magic. The next day, scoop cold chili mac into a hot skillet with a little butter. Fry until crispy on both sides for “Chili Mac Cakes.” Top with a fried egg.

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Recipe Card Summary (for quick printing)

Oven Baked 3-Ingredient Chili Mac Casserole
⏱️ 40 min total | ★☆☆☆☆
Ingredients: 1 lb elbow macaroni, 2 cans chili with beans, 4 cups shredded cheddar.
Do this: Boil pasta 5 min. Drain. Mix with chili + 3 cups cheese. Transfer to dish. Top with 1 cup cheese. Bake at 375°F for 25 min. Rest 5 min. Serve.
Per serving: 615 cal | 34g protein | 27g fat