Step 1

Preheat the oven to 350 degrees F.

Step 2

Heat 2 tablespoons of the olive oil in a large nonstick skillet over medium-high heat. Add the turkey and cook, while stirring and breaking up the meat with the back of a wooden spoon, until browned, about 3 minutes. Stir in the peppers, zucchini and onions, and saute until the veggies have started to soften, about 5 minutes more. Sprinkle the meat with the chili powder, cumin and paprika and give a good seasoning of salt and pepper; cook until fragrant. Stir in the chopped tomatoes and cook until the tomatoes have broken down and are soft, about 2 minutes more. Add the chicken broth and simmer lightly until the sauce is thickened and all the vegetables are tender, about 15 minutes.

Step 3

Add 1 to 2 tablespoons olive oil to a small bowl and season with a pinch of salt. Lightly brush both sides of the tortilla shells with the olive oil. Carefully place each tortilla shell over two bars of the oven rack. Bake until crisp, 8 to 10 minutes. Remove the shells with tongs after they are baked.

Step 4

Serve the warm taco shells filled with the turkey veggie filling and topped with lettuce, cheese, avocado, tomatoes, radishes and sour cream.