For the cookies

Cup of Yum
1. In the bowl of a mixer, beat the butter and sugar until fluffy, about 2 minutes
2. Add the eggs one at a time, beating well after each addition
3. Add the vanilla and salt, then slowly mix in the flour until thoroughly combined
4. Remove the dough from the bowl. Place the dough on a large piece of plastic wrap and shape it into a disc. Wrap the plastic wrap around the dough and chill for at least 1 hour, or up to 1 day before you plan to bake your cookies.
5. Preheat the oven to 350 degrees. Line a sheet pan with parchment paper or a nonstick baking mat. 
6. Divide the dough in half. Re-wrap one half of the dough and place it in the fridge. Roll the remaining dough into a 1/4 inch thick rectangle.
7. Using a 3-4 inch sized Christmas cookie cutters, cut out as many shapes as you can from the dough.
8. Re-roll the dough and repeat the process until you've filled your first baking sheet. Cookies should be spaced 1 1/2 inches apart on the sheet.
9. Place the pan of cookies in the fridge and chill for 20 minutes
10. Bake for 12-15 minutes or until cookies are set and the edges are just barely turning brown.
11. Cool the cookies completely
12. Repeat the same process with the other half of the dough that you previously put in the refrigerator.

For the frosting

1. Place the butter in the bowl of a mixer. Beat for 1 minute or until light and fluffy.
2. Add powdered sugar, 1 cup at a time, beating after each addition.
3. Add the vanilla extract and heavy cream. Beat until smooth and creamy.
4. If the frosting seems too thick, you can add 1 teaspoon of heavy cream at a time until the desired consistency is reached.
5. If the frosting seems too thin, you can add 1 tablespoon of powdered sugar at a time until the desired consistency is reached.
6. Divide the frosting into bowls, and add your desired food colors to each bowl; stir to combine.
7. After the cookies have cooled, spread a layer of frosting over each one and add sprinkles on top.
8. Serve immediately, or store in an airtight container for up to 5 days.