Preheat oven to 350°F (177°C). Spray cookie sheet with nonstick spray or use a silicone baking mat or parchment paper.

In a medium-sized mixing bowl, stir the butter and sugar together until creamed. Mix in the egg and vanilla.

Stir in flour, baking powder, salt, and sprinkles until just combined.

Place the dough in the center of the prepared cookie sheet into a tall ball (see picture above). Bake for 18-20 minutes until the edges are browned. The center may appear undone but that’s what you want. It will firm up. Allow to cool completely ON the baking sheet. Enjoy!