01 -
Heat a large skillet over medium-high heat. Add Italian sausage and chopped onion, cooking until the sausage is fully browned and onions are softened. Drain excess grease.
02 -
Reduce heat to medium-low. Stir in minced garlic, Alfredo sauce, marinara sauce, Italian seasoning, and red pepper flakes. Mix thoroughly to blend flavors.
03 -
Incorporate frozen cheese tortellini, ensuring pasta is coated in the sauce. Cover and cook for several minutes, stirring occasionally, until tortellini is tender and heated through.
04 -
Sprinkle shredded mozzarella over the tortellini mixture. Transfer skillet to a preheated 400°F oven for a few minutes, or keep covered on the stove, until cheese is fully melted.
05 -
Finish with a garnish of parsley flakes. Serve warm.