Step 1 Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C). Step 2 Stir sugar, peanut butter, and egg together in a mixing bowl until well combined. Step 3 Shape dough into 1-inch balls. If dough is too sticky, refrigerate until easy to handle, about 30 minutes. Step 4 Place dough balls on an ungreased cookie sheet. Step 5 Bake in the preheated oven until edges are set, about 10 minutes. Step 6 Press a chocolate kiss into the center of each warm cookie. Remove to a wire rack to cool.