Keto Italian Sausage Macaroni Casserole

Prep: 15 minCook: 45 min6 servingsmediumAmerican
Italian Sausage Macaroni Casserole with Cheddar and Tomatoes

A hearty one-dish dinner featuring Italian sausage, tender macaroni, and melted cheddar cheese in a savory tomato base. This comforting casserole combines the rich flavors of seasoned sausage with creamy milk and tangy diced tomatoes, creating a satisfying meal perfect for busy weeknights or family gatherings. The dish bakes until the cheese is golden and bubbly, making it an ideal comfort food that appeals to both kids and adults.

Ingredients

6 servings
  • 1 lb Italian sausage, casings removed
    ground beef1:1meat

    similar flavor profile

    Full guide →
  • 2 cups macaroni, uncooked
    penne pasta1:1carb

    holds sauce well

  • 1 cup cheddar cheese, shredded
    mozzarella cheese1:1dairy

    milder flavor

    Full guide →
  • 1 can diced tomatoes, drained
  • 1 cup milk
    heavy cream1:1dairy

    richer texture

    Full guide →
  • 1 tsp salt
  • 1 tsp black pepper

Instructions

  1. 1

    Preheat oven to 350°F

  2. 2

    Cook macaroni according to package instructions and drain

  3. 3

    Cook sausage in a skillet over medium heat until browned and drain excess fat

  4. 4

    Combine cooked macaroni, sausage, diced tomatoes, milk, salt, and pepper in a large bowl and mix well

  5. 5

    Transfer mixture to a baking dish and top with shredded cheddar cheese

  6. 6

    Bake for 30 minutes or until cheese is melted and bubbly

  7. 7

    Let cool for a few minutes before serving

Tips

Tip 1

Drain the diced tomatoes well to prevent the casserole from becoming watery during baking.

Tip 2

Let the sausage cool slightly before mixing with other ingredients to prevent the cheese from melting prematurely.

Good to Know

Storage

Cover and refrigerate for up to 3 days. Reheat in oven at 350°F until heated through.

Make Ahead

Can be assembled up to 1 day ahead. Cover and refrigerate, then bake as directed, adding 5-10 minutes if needed.

Serve With

Serve hot directly from the baking dish. Pairs well with a simple green salad or steamed vegetables.

See pairing guide →

Common Mistakes

Watch

Don't skip draining the sausage fat to avoid a greasy casserole

Watch

Avoid overcooking the pasta initially as it will continue cooking in the oven

Substitutions

Dairy-Free Swaps

cheddar cheese
mozzarella cheese1:1dairy

milder flavor

Full guide →
milk
heavy cream1:1dairy

richer texture

Full guide →

General Alternatives

Italian sausage
ground beef1:1meat

similar flavor profile

Full guide →
macaroni
penne pasta1:1carb

holds sauce well

Full guide →
Find more substitutions →

FAQ

Can I freeze this casserole?

Yes, wrap tightly and freeze for up to 3 months. Thaw overnight in refrigerator before reheating in a 350°F oven until heated through.

What if I don't have Italian sausage?

Ground beef, turkey, or pork work well as substitutes. Season with Italian herbs like oregano and basil for similar flavor.

How do I know when it's done baking?

The casserole is ready when the cheese is melted, bubbly, and lightly golden on top, typically after 30 minutes of baking.