This is Ava-baby's favorite recipe for the classic sugar cookie.
Adapted from Martha Stewart:
2 sticks of butter, room temperature
1 cup sugar
1/2 teaspoon salt
1 teaspoon vanilla extract
3 cups all-purpose flour (plus more for rolling and cutting)
Makes quite a bit of dough, so I half-ed the recipe and it needed about 2 cups of flour; also, if the dough is too soft - 10 minutes in the fridge will make it easier to work with.
Preheat over to 350 degrees
Use an electric mixer to cream butter, sugar, and salt until light and fluffy; then add egg and vanilla until combined. Finally, slowly add flour until incorporated.
Roll and cut out cookies, place on parchment-lined baking sheets.
Bake 7-12 minutes
Let cool and decorate
For the royal icing, I used 2 egg whites and a dash of vanilla to about a box of powdered sugar; I actually messed up making my icing so any other royal icing recipe should be used.