Follow these simple steps to create your Slow Cooker Sausage and Peppers:

1. Prepare Ingredients: Slice the bell peppers and onion, and mince the garlic.
2. Brown Sausages (Optional): In a skillet, heat olive oil over medium heat. Add sausages and brown them on all sides (about 5-7 minutes). This step enhances the flavor but can be skipped if you prefer to cook them directly in the slow cooker.
3. Add Ingredients to Slow Cooker: Place sliced bell peppers, onions, and garlic in the slow cooker. If you browned the sausages, cut them into bite-sized pieces and add them to the cooker. If not, add the whole sausages directly.
4. Add Tomatoes and Seasonings: Pour in the diced tomatoes with their juices. Sprinkle Italian seasoning, red pepper flakes (if using), salt, and pepper evenly over the mixture.
5. Cover and Cook: Stir the ingredients gently to combine. Cover with the lid and set the slow cooker to low for 6-8 hours or high for 3-4 hours.
6. Check for Doneness: When the cooking time is up, check that the sausages are cooked through and the vegetables are tender.
7. Serve: Carefully remove the sausages and slice if not already done. Serve the sausage and pepper mixture on a plate or in a bowl, garnished with fresh basil or parsley if desired.

By following these straightforward steps, you will create a flavorful and satisfying meal that brings everyone together at the table.