Have you tried one of the canned pizza sauces. That's what I use but I also make my own stuffed bell peppers. When I use jalapenos in my stuffed peppers, I use a picante sauce. If you need to thicken it up just use a tomato past that's in the tube. It's much thicker . The last couple minutes in the oven I top with cheese slices or even after pulling them out of the oven, I'll top with cheese.