Are you baking for the holidays? We try to use boxed mixes and add to them. For example, my daughter made Duncan Hines Brownies. She used their mix but added in chocolate chips. You can also use lemon cake mixes to create the lightest lemon cookies I've ever tasted:
1 box lemon cake mix
1/3 cup oil
1 teaspoon lemon extract
Mix it all together until well mixed. Create balls and roll in powdered sugar. Place on baking sheet and bake for 7-8 minutes at 375 degrees. These come out looking like crinkle cookies, but they're lemony!!