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Preheat your oven to 375°F. Lightly grease a 9x13 inch baking dish.

Cook the rigatoni pasta according to package directions until al dente. Drain well.

While the pasta cooks, heat olive oil and butter in a large skillet or Dutch oven over medium heat. Add the diced yellow onion and cook until softened, about 5-7 minutes.

Add the minced garlic and sliced cremini mushrooms to the skillet. Cook, stirring occasionally, until the mushrooms have softened and released their liquid, about 8-10 minutes.

Stir in the undrained diced tomatoes, vegetable broth, dried oregano, red pepper flakes, salt, and black pepper. Bring the mixture to a simmer and cook for 5 minutes, allowing the flavors to meld.

Remove the skillet from the heat. Stir in the fresh spinach until it wilts into the sauce. Add the cooked and drained rigatoni to the skillet and toss gently to coat the pasta evenly with the sauce.

Transfer the pasta mixture to the prepared baking dish. Sprinkle the shredded mozzarella cheese and grated Parmesan cheese evenly over the top.

Bake for 20-25 minutes, or until the cheese is melted, bubbly, and lightly golden brown. If desired, broil for the last 1-2 minutes for extra browning, watching carefully to prevent burning.

Remove from oven and let stand for 5 minutes before serving. Garnish with fresh chopped basil, as needed, if desired.


Preheat your oven to 375°F. Lightly grease a 9x13 inch baking dish.

Cook the rigatoni pasta according to package directions until al dente. Drain well.

While the pasta cooks, heat olive oil and butter in a large skillet or Dutch oven over medium heat. Add the diced yellow onion and cook until softened, about 5-7 minutes.

Add the minced garlic and sliced cremini mushrooms to the skillet. Cook, stirring occasionally, until the mushrooms have softened and released their liquid, about 8-10 minutes.

Stir in the undrained diced tomatoes, vegetable broth, dried oregano, red pepper flakes, salt, and black pepper. Bring the mixture to a simmer and cook for 5 minutes, allowing the flavors to meld.

Remove the skillet from the heat. Stir in the fresh spinach until it wilts into the sauce. Add the cooked and drained rigatoni to the skillet and toss gently to coat the pasta evenly with the sauce.

Transfer the pasta mixture to the prepared baking dish. Sprinkle the shredded mozzarella cheese and grated Parmesan cheese evenly over the top.

Bake for 20-25 minutes, or until the cheese is melted, bubbly, and lightly golden brown. If desired, broil for the last 1-2 minutes for extra browning, watching carefully to prevent burning.

Remove from oven and let stand for 5 minutes before serving. Garnish with fresh chopped basil, as needed, if desired.
