A simple, comforting slow cooker sausage and peppers recipe simmered in marinara and Italian herbs. Toss it with pasta, pile into hoagie rolls, or serve with crusty bread for an easy crowd-pleasing meal.
Add the sausages, all sliced peppers, sliced onion, minced garlic, salt, pepper, Italian seasoning, red pepper flakes (if using), and marinara sauce to the bowl of your slow cooker.
Stir everything gently so the ingredients are evenly distributed and coated with sauce.
Cover and cook on High for 3 to 4 hours or on Low for 6 to 8 hours, until the sausages are cooked through and vegetables are tender.
Remove the sausages to a cutting board, slice them into thick pieces, then return the slices to the slow cooker and stir to combine with the sauce and peppers.
Sprinkle with chopped parsley before serving. Serve over pasta, in hoagie rolls, or alongside crusty bread.