Cut the chicken breasts in half horizontally and pound thin. In one bowl whisk the eggs. In another bowl combine the panko breadcrumbs and very finely chopped pecans. (Too big of pieces will burn! I use a blender or food processor)
Dip each piece of chicken into the egg mixture, then coat well in the pecan and panko mixture, pressing lightly so the coating sticks.
Add cooking oil to a large skillet over medium heat. Once hot, cook the chicken in batches until golden brown, crispy, and cooked through, about 4–5 minutes per side depending on size. Transfer to a plate or wire rack. Keep warm in the oven.
In a separate skillet or saucepan, heat the oil over medium heat. Add the ginger, garlic, and chili flakes if using. Cook for about 30 seconds until fragrant. Careful not to burn!
Add the brown sugar, orange juice, sugar, vinegar, and soy sauce. Stir and bring to a gentle simmer.
In a small bowl whisk together the cornstarch and water until smooth. Pour into the sauce and stir until thickened and glossy.
Add the crispy chicken to the sauce and toss until coated.
Serve immediately while the chicken is still crispy and saucy.