Ingredients
1 cup peanut butter
1 cup sugar
1 egg
1 teaspoon vanilla extract

Steps
1. Preheat oven to 325°F. Combine all ingredients in medium bowl.
2. Shape dough into 1-inch balls; place 2 inches apart on ungreased baking sheet. Flatten with fork in a crisscross design.
3. Bake 8-10 minutes until lightly browned and slightly puffed. Cool 1 minute on baking sheet, then remove to wire rack. Serve.