The Kitchn: Coffee cake cookies are the coziest fall treat imaginable
3/4 cup packed light or dark brown sugar
1 large egg
1 large egg yolk
1 tablespoon vanilla extract
For the streusel coating:
4 tablespoons (1/2 stick) unsalted butter
1/2 cup all-purpose flour
1/2 cup packed light or dark brown sugar
1/2 cup granulated sugar
2 teaspoons ground cinnamon
...continued