Put the halved peppers in a baking dish. Sprinkle with 1/4 tsp garlic salt. Divide the ground turkey between the peppers and press into the bottoms. Sprinkle with another 1/4 tsp garlic salt. Bake for 30 minutes.
Divide the ricotta cheese between the peppers. Sprinkle with the remaining 1/2 tsp garlic salt. Sprinkle the mozzarella on top. Put the cherry tomatoes in between the peppers, if using.
Bake for an additional 30 minutes until the peppers are softened, the meat is cooked, and the cheese is golden.