Allow 2 inches of space around sheet for proper baking. Baking sheet on bottom shelf of oven. Bake in center of oven. Oven is too hot. Check oven temperature with separate oven thermometer.
Cookies break or crumble as they're taken from baking sheet.
Cookies stuck to sheet. Grease with Butter Flavor Crisco. Cookies left on baking sheet too long. Remove from sheet at time recipe indicates.