Add the olive oil to a very large skillet or Dutch oven over medium heat.
1 tablespoon olive oil
Once heated, add in the sausage and use a wooden spoon to break it up into chunks
1 pound Italian sausage
Brown the meat.
Add in the onion, garlic, and Italian seasoning, sautéing until the onions are soft.
½ onion, 3 cloves garlic, 1 teaspoon Italian seasoning
Pour the marinara sauce and broth over the meat and stir until combined.
36 ounces marinara sauce, 1½ cups low-sodium beef broth
Spray the crockpot with nonstick cooking spray.
Spread a layer of meat sauce in the bottom of the slow cooker covering it completely.
Top with half of the uncooked pasta.
1 pound dry ziti pasta
Drop 4-5 spoonfuls of ricotta over pasta.
1 cup ricotta cheese
Sprinkle ½ cup mozzarella cheese over the ricotta.
2 cups mozzarella cheese
Repeat with another layer of meat sauce, the remaining pasta, and the remaining ricotta, and ½ cup mozzarella.
Spread the remaining meat sauce over the top.
Cover and cook on high for 1½-2 hours or on low for 2-4 hours.
Top with remaining mozzarella cheese.
Serve with grated parmesan and fresh basil, if desired.
Grated Parmesan cheese, Fresh basil