Slice the chicken breasts horizontally into pieces about 1/2 inch thick. Pat dry if needed and lightly season with salt and pepper.
Crush the Ritz crackers into coarse crumbs with no large pieces.
Set up three shallow dishes: the seasoned flour, the eggs whisked with milk, and the crushed Ritz crackers.
Coat each piece of chicken in the flour first, followed by the egg wash, then the Ritz cracker crumbs until well covered.
Place the breaded chicken directly onto the greased sheet pan.
Bake for about 20 minutes without flipping, or until the thickest part of the chicken reaches 165°F. Thicker pieces may require additional time.
Let the chicken rest for about 5–10 minutes before handling and serving.
Notes
Keep the chicken close to 1/2 inch thick so the center cooks through before the Ritz coating gets too dark. Crush the crackers into coarse crumbs rather than leaving large pieces, which can brown too quickly while baking.