In a large mixing bowl, beat 1 cup of softened butter and 1 cup of granulated sugar together until light and fluffy, about 3-4 minutes.

Blend in 2 large eggs and 1 teaspoon of vanilla extract until well combined.

In a separate bowl, whisk together 2 ½ cups of all-purpose flour and 1 teaspoon of baking soda. Gradually add this dry mixture to your creamed butter and sugar, mixing until just incorporated.

Divide the dough into three equal portions. Leave one uncolored, then add red and green gel food coloring to the other two portions.

Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper. Drop random pieces of the red, green, and white dough onto the sheet, mixing them up.

Cover the dough with another sheet of parchment paper and gently press down to form an even layer about ¾-inch thick.

Bake for 10-15 minutes or until the edges are lightly golden. Perform a toothpick test to check for doneness.

Remove the bars from the oven and allow to cool in the pan for 5 minutes before transferring to a wire rack to cool completely.

Once completely cool, spread a generous layer of buttercream frosting on top.

Sprinkle colorful Christmas sprinkles over the frosted surface.

Let the frosting set for a few minutes, then cut the bars into squares or rectangles.