Add the butter, flour, powdered sugar and salt to a mixing bowl and beat for a couple minutes, until the dough comes together.

Stir in about 3 tablespoons of the sprinkles to evenly distribute them throughout the dough.

Place a large piece of plastic wrap on your countertop, and dump the dough onto it. Flatten the dough out into a rectangle about one-quarter-inch tall.

Sprinkle the rest of the sprinkles on top and press them down into the top of the dough.

Wrap the dough in the plastic wrap, and refrigerate it for at least an hour.

When you’re ready to bake, preheat the oven to 350 degrees.

Prepare a couple baking sheets by lining them with parchment paper, and set them aside.

Unwrap the cookie dough and cut it into about one-inch squares.

Place the squares about one inch apart on the prepared baking sheets, and bake them, one sheet at a time, for 10 to 12 minutes or until the dough is set and the edges are just slightly golden brown.

Let the cookies cool on the pan, and then slide them into an airtight container.