
If you love sugar cookies this is the dessert for you. It's so easy and so delicious and always a winner.
Preheat oven to 350 degrees. Line an 8X8 baking dish with parchment paper.
In a mixing bowl combine butter and sugar, mix with a mixer until fluffy.
Next add in egg and vanilla. Continue mixing and add in flour and baking powder. Add in milk. You want to the dough to hold together. Not be crumbs. Fold in the sprinkles.
Next spread the batter into the pan. This may take a bit since it's thick, just work it to the edges with your hands and get it even.
Bake in preheated oven for 22-30 minutes (all ovens vary). Remove from oven and allow to completely cool.
Blend together all frosting ingredients (except the sprinkles) Spread onto cookie bars and add sprinkles.