Heat turkey according to manufacturer's directions. Using a sauté pan over medium high heat, add oil. Lightly sauté onion rings until browned on both sides. Spread BBQ sauce evenly over prepared pizza crust. Top with turkey, onions, then cheese. Add asparagus, peaches and peppers. Place pizza crust on a baking sheet and bake according to manufacturer's directions until cheese is melted and pizza is cooked through.