National Peanut Butter Cookie Day is celebrated on June 12th and highlights the deliciousness of peanut butter cookies, which can be made easily with just three ingredients: peanut butter, sugar, and an egg. This day encourages people to bake and share these cookies, often featuring the iconic crisscross fork marks that help the dense dough bake evenly. While peanut butter is commonly known for its use in sandwiches, it is also a versatile ingredient in both savory and sweet dishes. The holiday promotes creativity in baking, with suggestions for variations like peanut butter roll-out cookies or fluffernutter sandwich cookies. Additionally, it is important to consider potential peanut allergies when sharing cookies with others. Overall, National Peanut Butter Cookie Day is a fun occasion to enjoy baking and sharing these tasty treats with friends and family.