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How to make watermelon sandwich cookies
Combine all of the ingredients for the frosting in a mixing bowl.
Beat the ingredients at medium speed with a handheld mixer or a stand mixer with a paddle attachment.
Cover the mixing bowl with plastic wrap and place it in the refrigerator until you are ready to assemble the cookies.
Preheat a griddle or nonstick skillet and spray it with nonstick cooking spray. Whisk the flours, baking powder, baking soda, sugar and salt in a mixing bowl.