Preheat the oven to 425°F and spray a baking sheet with olive oil spray.
Pat the 16 ounces chicken breasts dry with paper towels and cut into bite-sized pieces (about 1-inch).
In a shallow bowl combine 6 tablespoons whole wheat Italian seasoned breadcrumbs, 2 tablespoons panko, and 2 tablespoons grated Parmesan cheese.
In a separate bowl pour 2 teaspoons olive oil. Season the chicken with 1/2 teaspoon kosher salt and black pepper to taste, add the chicken to the oil, and toss until all pieces are evenly coated.
Working in batches, place a few chicken pieces into the breadcrumb mixture and press the crumbs onto all sides so each piece is well coated. Transfer the coated pieces to the prepared baking sheet in a single layer, leaving space between pieces.
Lightly spray the tops of the coated chicken pieces with olive oil spray.
Bake for 8–10 minutes. Use tongs or a spatula to flip each piece, then lightly spray the tops again if desired.
Bake 4–5 minutes more, or until the nuggets are cooked through and reach an internal temperature of 165°F (no pink inside).
Remove from the oven and let the nuggets rest 1–2 minutes before serving.