Gather ingredients. Preheat the oven to 375º. Place the boneless chicken thighs in a ziplock bag, flat or wrap them in plastic wrap.
Tenderize the chicken with a heavy rolling pin or mallet. This helps to make the chicken so tender and mouthwatering good. Literally hit the chicken with the mallet or heavy rolling pin :)
In 3 separate shallow bowls add: whisked eggs in one bowl, bread crumbs, parmesan, seasonings in another bowl. Add flour to the third bowl. This is the dredging station for the chicken. There should be 3 different bowls/steps for the chicken.
Dunk the chicken in the flour, followed by the egg wash and then finish off in the bread crumb mixture. Place the breaded chicken thigh on a parchment lined baking sheet. Repeat the process until all thighs are finished.
Bake the chicken for 12 minutes, pull it out and gently flip it. Cook for another 10 minutes or until the center of the chicken reaches 165º.
Pull the chicken out of the oven, add 2-3 tablespoons of the marinara on each chicken cutlet. Top each chicken cutlet with parmesan and mozzarella or cheese of choice.
Place oven on broil low. Put the chicken back in and cook for about 3-5 minutes. Keep a close eye on them! All ovens vary so it's important to keep an eye on them and avoid burning.
Once the cheese is melted and bubbling pull the chicken Parmesan thighs out. Garnish with fresh herbs and serve.