Preheat your oven to 220°C (425°F). Line a baking sheet with parchment paper or a silicone mat for easy cleanup.
Slice the chicken breasts into even 1/2 inch thick cutlets. Pat them dry with paper towels and season lightly with salt and pepper.
In a shallow dish, beat the egg and mix in a splash of milk until well combined. In another dish, combine panko, grated Parmesan, Italian herbs, and a pinch of salt.
Dip each chicken cutlet into the egg mixture, allowing excess to drip off, then coat thoroughly in the breadcrumb mixture. Gently press the coating onto the chicken to adhere well.
Arrange the coated chicken cutlets on the prepared baking sheet, leaving space between each. Lightly spray the tops with olive oil spray to promote crispiness.
Bake in the preheated oven for 15-20 minutes, or until the edges are golden brown and the internal temperature reaches 75°C (165°F). Use an oven thermometer to ensure proper heat.
For extra crispness, switch to the broiler setting for the last 2-3 minutes, watching carefully to prevent burning. The coating should be bubbly and deep golden.
Remove the chicken from the oven and transfer to a wire rack if available, letting it rest for 3-5 minutes. This helps the crust stay crispy and the juices to redistribute.
Squeeze fresh lemon over the cutlets or garnish with chopped herbs for a bright finishing touch. Serve hot for the best crispy texture.