These thick and chewy Milk Bar-style birthday cake cookies are easy to make and perfect for parties, featuring a nostalgic buttery crumb and playful rainbow sprinkles.
Do not skip browning the butter for rich flavor. Chill dough to prevent spreading and achieve thick chewy texture. Avoid overmixing to keep cookies tender. Bake until edges are set but centers remain soft for best chew. Use sturdy sprinkles to avoid color bleeding. Store with a slice of bread in an airtight container to keep cookies chewy longer.
Keywords: birthday cake cookies, Milk Bar cookies, thick chewy cookies, party cookies, sprinkles cookies, easy cookie recipe