Using a large mixing bowl, toss the tomatoes, lemon juice and parsley with about 1 tablespoon of olive oil and season with salt and pepper. Set aside. I like to do this step first so the flavors can begin to come together.
Next, you are going to set up a dredging station. Using a medium sized, shallow dish, beat the eggs with the Dijon mustard, cayenne and red pepper flakes and season with salt and pepper. Pour the panko into another, separate medium sized, shallow dish. Dip the chicken into the egg mixture, then dredge in the panko; pressing gently to help it adhere.
Using a large skillet over medium-high heat, heat about 1/3 cup of the olive oil until shimmering. Add the chicken and cook over moderately high heat, turning once or twice, until browned and cooked throughout, for about 8-10 minutes, depending on the thickness of your chicken. Transfer the chicken to plates that have fresh greens and/or arugula on them. Please the chicken on top.
Spoon the tomatoes and parsley over the chicken and garnish with the Parmesan cheese. Drizzle a little more extra virgin olive oil if desired. Serve immediately and enjoy!