Step 1: Bring a large pot of salted water to boil and cook penne pasta according to package directions until al dente, about 10-12 minutes.

Step 2: While pasta cooks, heat olive oil in a large skillet over medium-high heat.

Step 3: Add chicken sausage to skillet, breaking it up with a wooden spoon, and cook for 4-5 minutes until browned.

Step 4: Add diced onion and sliced bell pepper to the skillet and cook for 2-3 minutes until softened.

Step 5: Stir in minced garlic and Italian seasoning, cooking for 30 seconds until fragrant.

Step 6: Add drained diced tomatoes and chicken broth, then simmer for 2 minutes.

Step 7: Drain pasta and add it to the skillet along with fresh spinach, tossing until spinach wilts.

Step 8: Remove from heat, stir in Parmesan cheese, and season with salt and pepper to taste.

Step 9: Divide into 4 meal prep containers and refrigerate for up to 4 days.