Step 1

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

Step 2

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

Step 3

Stir in flour, baking soda, salt, cream of tartar, and sprinkles until just combined. Do NOT overmix.

Step 4

Place the dough in the center of the prepared cookie sheet into a tall ball (see picture above). Bake for 14-16 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!