The present disclosure relates to oat-based peanut butter- flavored compositions and methods of making such compositions. In particular, a method is disclosed of roasting substantially intact groats until CIELAB L*-value change per minute, and CIELAB b*- value change per minute achieve a negative slope to produce roasted oats having a peanut butter flavor. Compositions including roasted oats having a peanut butter flavor are also disclosed.