Cream the butter and sugar well: Keep beating until the mixture is light and fluffy. This helps to 'lift' the cookies and get the texture just right. Also, the butter should be neither icy cold from the refrigerator nor so warm it's nearly melting.
Don't overmix: When mixing the wet and dry ingredients together for your Lucky Charm marshmallow cookies, don't overmix. As long as you've creamed the butter and sugar well, you only have to mix the flour mixture in until just incorporated.
Chill the dough: Don't skip chilling the dough because it helps the cookies to come out nice and thick rather than spreading out too much during baking.
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