Heat the oven to 375°F. Lightly grease 8 cups of a standard muffin tin.
In a large bowl, whisk the egg with the salsa, cumin, chili powder, garlic powder, and salt.
Add the ground turkey, black beans, corn, breadcrumbs, and 1/4 cup of the cheddar. Gently mix until just combined, taking care not to mash the beans.
Divide the mixture evenly among the 8 prepared muffin cups. Press it in gently, then sprinkle the remaining cheddar over the tops.
Bake until the muffins are cooked through and the centers reach 165°F, about 22 to 26 minutes. Let them rest in the tin for 5 minutes before removing.
Sprinkle with chopped cilantro and serve warm.