Follow Food & Supply Source on Instagram & Facebook to see fresh, new menu ideas every Monday!  #MenuMonday   Ingredients: 1 cup unsalted butter slightly softened 1/2 cup powdered sugar, do NOT pack 1 tsp vanilla 2 1/4 cups all purpose flour, do NOT pack 1/2 tsp salt 1 cup mini M&M’s any color Additional powdered sugar for rolling Directions: 1. Preheat the oven to 350°F. Line two cookie sheets with parchment paper. 2. Mix butter, 1/2 cup powdered sugar, and vanilla with an electric mixer until fluffy. Add flour, salt and mix until the dough comes together. This will take a minute or two with a stand mixer. If you’re using...