PREHEAT oven to 375°F. Place chicken in lightly greased 13x9-inch baking dish; set aside.
MIX mayo and mustard until well blended. Spread top side of each chicken breast half with 1 Tbsp. of the mayo mixture; sprinkle evenly with almonds.
BAKE 20 to 25 min. or until chicken is cooked through (165°F).