Italian Sausage Tortellini Bake

Italian Sausage Tortellini Bake - allrecipes.com
Of course, I had to make my own adaptions to the recipe, so here's my version.
1 pound hot Italian sausage
1/2 yellow onion, finely chopped
1 (24 oz) jar marinara sauce
1 (14 oz) can Italian-sytle diced tomatoes
1 teaspoon garlic powder
1/4 teaspoon red pepper flakes
1 (20 ounce) package frozen cheese-filled tortellini
2 cups shreeded mozzarella cheese

Heat a large pot over medium heat. Crumble sausage into the saucepan; add onion and green bell pepper. Cook and stir the sausage mixture until the sausage is completely browned, 7 to 10 minutes. Drain grease.

Pour marinara sauce and diced tomatoes over the sausage mixture; season with garlic powder and stir. Bring the mixture to a simmer, reduce heat to medium-low, and cook at a simmer until the diced tomatoes break down into the sauce, 30 to 45 minutes.

Preheat oven to 350 degrees F (175 degrees C).

*** Because I didn't buy frozen tortellini, I was able to skip the step of cooking them. I bought them in the deli section of my local Target.  ***

Gently fold the cooked tortellini into the simmering sauce; cook together another 5 minutes. Pour tortellini and sauce into a 13x9-inch baking dish; top with mozzarella cheese.

Bake in preheated oven until cheese is golden brown, 20 to 30 minutes.