Place each chicken breast between 2 sheets of parchment and pound to about 1/3 inch, even thickness. Season each with 1/4 teaspoon salt.
Place the flour, whisked eggs, and panko in 3 separate shallow dishes.
Dredge each breast in flour, then egg, then panko, coating both sides.
Heat about 2 tablespoons oil in a skillet over medium-high heat. Fry the chicken until golden, about 5 to 6 minutes, then flip and cook the second side until golden and cooked through (165°F), about 3 to 4 minutes more. Cook in batches to avoid crowding, adding oil as needed.
Toss the tomatoes, cucumbers, corn, and cilantro with the lemon juice, olive oil, and remaining salt.
Rest the chicken on a cooling rack briefly, then plate and top with the summer salad. Serve with lemon wedges if desired.
Notes
Air fryer: Bread as directed, spritz with oil, then air fry at 400°F for 16 to 18 minutes until golden and crispy, working in batches to avoid crowding.
The corn goes in raw. Fresh summer corn is sweet enough to eat straight off the cob.
Make ahead: Bread the chicken up to the morning of and refrigerate covered until ready to fry.
Store leftovers up to 3 days. Reheat in a 350°F oven or air fryer to keep the crust crisp.