[header] How to make root beer float cookies [title] Preheat the oven to 350 ° f (180 ° c). [step] Line 2 baking sheets with parchment paper. [title] Place the butter, granulated sugar and brown sugar in a mixing bowl. 
[step] Beat the ingredients at medium speed with a handheld mixer or a stand mixer with a paddle attachment. When you're done, the butter mixture should be light and fluffy.