Serves 4
Hands-on time: 10 minutes, Total time: 40 minutes
Printable Recipe

12 ounces ziti or other short pasta (about 4 cups)
1 tablespoon olive oil
1 large onion, chopped
2 cloves garlic, finely chopped
1/2 pound lean ground beef
Kosher salt and black pepper
1 26-ounce jar marinara sauce
1 bunch spinach, thick stems removed (about 4 cups)
1/2 cup ricotta
1/2 cup grated Parmesan (2 ounces)
1 cup grated mozzarella (4 ounces)