Preheat oven to 350°F. Line a baking sheet with parchment paper and set aside.
In a large bowl, using a spatula or spoon, mix the melted butter and brown sugar until combined. Add egg and vanilla; mix until combined. Set aside.
1 cup unsalted butter, 1 cup brown sugar, 1 large egg, 3 teaspoons pure vanilla extract
In another large bowl, whisk the flour, baking soda, baking powder, cinnamon, and salt. Fold the four mixture into the wet mixture, folding until well combined.
2 cups all-purpose flour, ¼ teaspoon baking soda, 1 teaspoon baking powder, 1 teaspoon ground cinnamon, ½ teaspoon kosher salt
Using a medium cookie scoop (2 tablespoons in volume), drop balls of cookie dough into the granulated sugar, coat completely, and place 2 inches apart on the prepared baking sheet.
½ cup granulated sugar
Using a glass, or something with a flat bottom, press the cookies flat.
Bake the cookies for 8-10 minutes, until the tops no longer look wet. Cool on the cookie sheet for 2 minutes, then move to a rack to finish cooling.