Preheat oven to 400 degrees. on a sheet pan lined with foil, place sliced bell peppers and sliced 1/2 onion, drizzling lightly with oil. sprinkle lightly with taco seasoning, reserving most for the ground meat. toss to coat and roast for 15 minutes or until soft.
In the meantime, heat 1 tbs. olive oil in a skillet over medium heat, then add in ground turkey. cook until no longer pink then add in 1/2 cup of water and the rest of the taco seasoning. bring to a boil then simmer for 5 minutes.
Make tostadas by using a spatula to spread on refried beans, then add cooked peppers + onions. top with taco meat and your fave optional toppings! tastes great with hot sauce or salsa on top as well!