Bring a large pot of salted water to a boil. Cook the short pasta according to package instructions until just under al dente. Drain and drizzle with olive oil.
In a skillet, heat olive oil over medium-high heat. Add the diced onion and cook until translucent. Add the Italian sausage, breaking it into smaller pieces, and cook until browned and the internal temperature reaches 165°F. Drain excess grease.
In a large bowl, combine ricotta cheese, beaten egg, 2 cups of mozzarella cheese, grated parmesan, chopped basil, Italian seasoning, and minced garlic. Mix until creamy.
Fold the cooked pasta and browned sausage into the cheese mixture until evenly coated.
Preheat the oven to 375°F. Spray a 9x13-inch baking dish with oil. Spread 2 cups of marinara sauce on the bottom of the dish. Pour the pasta mixture into the dish and top with remaining marinara and mozzarella cheese.
Cover with foil and bake for 20 minutes. Remove the foil and bake for an additional 10 minutes, or until the cheese is bubbly and golden. Broil for 2-3 minutes if desired.
Let cool for 10 minutes before serving. Top with additional chopped basil.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3-5 days. Reheat in the oven or microwave.