Sear the Italian sausage links in a skillet before adding to the crock pot to develop a caramelized crust that locks in flavors and prevents a greasy final dish.

Place denser vegetables like onions on the bottom of the crock pot, then add peppers and garlic on top to ensure even cooking and prevent mushy results.

Mince fresh garlic and add it during the last 30 minutes of cooking to preserve its bright, aromatic qualities rather than letting it turn bitter during long slow cooking.

Use only one 28oz can of crushed tomatoes and skip added water—the peppers and onions release moisture naturally, preventing a watery sauce that dilutes the rich Italian flavors.

Reserve 1 cup of starchy pasta cooking water and stir it into the finished sauce to create a silky, cohesive coating that binds all flavors together beautifully.