Preheat the oven to 375 F. Place the butter in a baking sheet or pan and into the oven to melt while the oven preheats.
Place the sliced sausage, potatoes, onion, garlic, bell peppers, and sun tomatoes on the baking sheet and sprinkle spices, salt, and pepper on top. Bake for 1 hour or until the potatoes are cooked, and the sausage is brown, mixing every 20 minutes or so.