Sugar Cookies - Miz En Place

Ingredients

• 3-1/2 cups all-purpose flour
• 1-1/2 tsp baking soda
• 1/4 tsp salt
• 1 cup unsalted butter (softened)
• 3/4 cup granulated sugar
• 1 egg
• 1/2 cup sour cream
• 1 tsp vanilla extract
• 1/2 cup unsalted butter (softened)
• 2 cups powdered sugar
• 2 tbsp milk
• food coloring (for decorating)
• sprinkles (for decorating)