Easy Gluten-Free Brownies

butter, melted (, dairy-free use coconut oil or Earth Balance of Smart Balance Butter)

granulated sugar

brown sugar (, packed)

eggs (, room temperature)

pure vanilla extract

cup all-purpose gluten-free flour ((I like Pillsbury gluten-free))

xanthan gum ((leave out if your flour already has it))

cocoa powder

baking soda

salt