Preheat oven to 315F and line a baking sheet with parchment paper.

Cream together butter, sugars, and vanilla extract until light and thoroughly creamed.

Separately, whisk together flour, baking powder, and salt.

With electric mixer on medium-low, gradually add flour mixture to butter mixture until combined. Mixture will be very dry and sandy, but if you pinch it with your fingers it should cling together.

Add sprinkles, then use your hands to incorporate the sprinkles and to pinch together the dough, creating clusters. I usually create large clusters that I break into smaller pieces. Ultimately it should resemble streusel with varying sizes of clumps when you’re finished.

Spread evenly onto prepared baking sheet and bake on 315F (155C) for 10-12 minutes. Allow to cool completely on baking sheet. The crumbs will be soft while warm, but will become firm once they’ve cooled completely.

Use as desired over cakes, cupcakes, cookies, or even just enjoy by the handful.