• Line a 9x13 baking dish with parchment paper. Set aside.
• Preheat the oven to 375 degrees.
• In a large bowl using an electric mixer combine butter and sugar until light and fluffy.
• Add eggs and vanilla and beat until combined.
• Next, add flour baking soda, and salt until a dough forms.
• Spread cookie dough into the prepared pan.
• Bake 12-15 minutes until puffed and golden brown.
• Allow cookie bars to cool completely in the pan.

Make the buttercream frosting.

• In a large bowl with an electric mixer whip your butter.
• Add in the powdered sugar and whip again.
• Add in the milk and vanilla and beat again until light and fluffy.
• Spread frosting all over the cookie bars.
• Sprinkle with holiday sprinkles or holiday chips.
• Slice into bars and serve.