Prepare the chicken by cutting the breasts into 1 ½ inch pieces.
Add the beer, spicy mustard, and oil in a large mixing bowl.
Add the chicken pieces to the mixing bowl, toss to coat evenly. Cover, place in the fridge for 20 minutes to marinate.
While the chicken is marinating, prepare the pineapple and peaches. Peel and core the pineapple then slice into ½ inch thick rings. Cut the peaches in half from top to bottom, remove the pits, then slice each half into 1 inch thick wedges.
Preheat your oven to 180° C (350° F) and spray a baking sheet with non stick cooking spray. Mix together the bread crumbs and Cajun seasoning in a pie dish.
Remove chicken pieces from marinade and discard marinade. Roll chicken pieces in the bread crumbs to coat and place pieces on the prepared sheet.
Bake for 20 minutes turning once, or until light golden brown and no longer pink in the center.
Remove chicken to a serving tray.
Prepare your grill for direct medium heat.
Spray the prepared fruit with non stick cooking spray, place fruit on the grill, and cook 5-8 minutes or until just tender.
Serve with the chicken nuggets and Peachy Mustard Glaze, enjoy.