Cheesy Greek Yogurt Chicken Bake

0 Preheat your oven to 400° F with your oven rack centered. 
1 Lightly oil your baking pan (I used a 13x9 ceramic dish).
2 Place your thinly pounded chicken breasts in the baking dish.
3 In a small bowl mix together the Greek yogurt, mustard, half of the white cheddar and parmesan, cornstarch, garlic powder, oregano, salt, and pepper.
4 Slather an even amount of the mixture onto each chicken breast. Top with the leftover cheddar and parmesan. 
5 Bake for 30 minutes. Once it is finished baking you can place it under the broiler for a few minutes for the cheese to get toasty and bubbly or eat it!NOTE: the thickest part of the chicken should read 160 to 165 degrees F with a digital thermometer.