In a large bowl, beat the butter, 3/4 cup brown sugar, and the granulated sugar together until the mixture is light and fluffy, about 3 minutes. Add the egg, egg yolk, and peanut butter.

Add the salt, flour and baking soda to the peanut butter mixture. Stir until well combined.

Place the remaining 2 tablespoons of sugar in a small bowl. Roll 1 tablespoon of dough into a ball and then roll it in the granulated sugar. Place the dough ball onto a parchment or baking mat lined baking sheet. SLIGHTLY compress with fork.

Bake at 350 degrees for 10 minutes. Remove from the baking sheet and let cool on a wire rack.

When the cookies are cooled, melt the chocolate chips and oil together in a small bowl. Dip half the cookie in the chocolate, place on a lined baking sheet (waxed paper works great), and sprinkle with festive sprinkles. Let the chocolate set before serving or storing.