Preheat your oven to 375°F (190°C). This will ensure your tacos get nice and crispy when baked.
In a large skillet over medium heat, add the ground chicken. Cook for about 5 minutes, breaking it apart with a wooden spoon, until it starts to brown.
Next, add in the minced garlic, diced onion, and green bell pepper. Sauté for another 3-4 minutes until the vegetables are softened.
Stir in the fire-roasted diced tomatoes, diced green chiles, chili powder, smoked paprika, cumin, kosher salt, dried oregano, and cayenne pepper. Mix everything thoroughly and let it cook for 5 more minutes to meld the flavors.
In a baking dish, arrange the taco shells. Spoon the chicken mixture evenly into each shell, and top with shredded cheese.
Place the baking dish in the oven and bake for 10-12 minutes, or until the cheese is melted and bubbly, and the taco shells are crispy.
Once out of the oven, let the tacos cool for a minute. Top with minced white onion, cilantro, and sliced radish if desired. Serve immediately and enjoy your homemade Baked Ground Chicken Tacos!
