Prepare the chicken by placing each breast on a cutting board, one at a time. Pound the chicken breasts to ½-inch thickness using a meat mallet.
Cut the chicken breast in half and set aside. Repeat with the remaining pieces of chicken.
Make the dredging station by pouring the flour into another bowl.
Combine the eggs and milk in a separate bowl and beat with a fork until well combined.
Combine the panko with the oregano, garlic powder, paprika, sea salt, and freshly cracked pepper to taste; mix well.
Dredge the chicken evenly in flour. Dip evenly in egg. Dredge evenly in the panko mixture.
Place coated chicken on a baking tray covered with parchment paper. Repeat with the remaining pieces of chicken.
Place the baking sheet in the refrigerator for at least 30 minutes. Side Note: This will help the breading stick to the chicken.
Heat the olive oil in a large skillet over medium heat. Once the pan is hot, add the chicken, cooking a few pieces at a time. Cook for 3-4 minutes. Flip the chicken over and cook for 2-3 minutes, or until golden brown and cooked through.
Place on a plate lined with paper towels to soak up any remaining grease.
Drizzle some well-whisked vinaigrette onto the greens, tomato halves, roasted bell pepper, kalamata olives, and feta cheese; toss to coat evenly.
Serve a piece of chicken with a large spoonful of greens on each plate. Enjoy.