Ingredients:
• 2 pounds beef sirloin, thinly sliced

• 1 green bell pepper, sliced

• 1 red bell pepper, sliced

• 1 large onion, sliced

• 8 ounces mushrooms, sliced

• 2 cloves garlic, minced

• 1 teaspoon salt

• 1 teaspoon black pepper

• 1 teaspoon dried oregano

• 1/2 teaspoon crushed red pepper flakes

• 10 ounces provolone cheese, sliced

• 10 ounces cheddar cheese, shredded

• 4 cups cooked pasta (such as rotini or penne)

Directions:
1.
Sear the Beef: In a skillet, sear the thinly sliced beef sirloin over medium-high heat until browned but not fully cooked.
2.
Prep the Slow Cooker: Add the seared beef to the slow cooker. Layer with sliced green and red bell peppers, onions, mushrooms, and minced garlic.
3.
Season: Sprinkle the mixture with salt, black pepper, oregano, and crushed red pepper flakes. Gently stir to combine.
4.
Cook: Cover and cook on low for 6-7 hours, until the beef is tender and the vegetables are fully cooked.
5.
Add Pasta: About 30 minutes before serving, stir in the cooked pasta to soak up the flavorful juices.
6.
Cheesy Finish: Layer provolone slices on top, then sprinkle with shredded cheddar cheese. Cover and cook until the cheese is melted and bubbly.
7.
Serve and Enjoy: Scoop out generous portions of this cheesy, savory casserole and enjoy a family-friendly meal!

This recipe is perfect for busy weeknights or family gatherings. Enjoy!