Spray 9"x13" cookie sheet with baking spray and set aside.
In mixer Cream butter and sugar until light and fluffy, I let it mix for 4-5 minutes. Add in eggs one at a time and combine until fully incorporated add in vanilla.
Mix the flour,salt and baking soda together in a separate bowl. Add to butter egg mixture one large spoonful at a time and mix until all ingredients are combined. Fold in candies.Spread on a prepared cookie sheet.
Bake at 375 degrees for 10-15 min or until toothpick comes out clean.(Do not overbake!)Remove from oven and let cool completely.
While cookie bar cools start on the frosting!
Beat the butter on medium speed until smooth.Add in the powdered sugar and mix on low speed at first, then increase to medium speed until mixture starts to come together.
Add in the vanilla extract then the heavy cream one tablespoon at a time until desired consistency is achieved.(I like mine a creamy spreadable consistency), add red food color one drop at a time until the desired color is reached. Mix for another minute or two until color is fully incorporated in frosting.
Once pan of cookie bars are completely cooled frost the cookie bars covering the entire surface of the cookie.
Top with sprinkles, cut into bars and enjoy!!