These brownie crinkle cookies are the perfect combination of rich chocolate brownies with a fudgy center and chewy edges with a crinkle top that's typical of chocolate crinkle cookies!
Melt butter and chocolate chips using a double boiler method or in the microwave with small increments of time. Let cool slightly.
Meanwhile, beat the eggs and sugars in a medium bowl on high with a handheld mixer for 4 minutes (set timer). Slowly pour in the melted chocolate mixture.