Preheat oven to 375° and line baking sheets with parchment paper.

Cream the butter, brown sugar, and powdered sugar in a large mixing bowl until light and fluffy.

Mix in the egg and vanilla extract until fully combined.

Add flour, 1 1/2 teaspoons cinnamon, baking powder, and sea salt all at once. Mix just until the dough comes together and no dry streaks remain.

In a small bowl, stir together 1/4 cup granulated sugar and 1 1/2 teaspoons cinnamon for rolling.

Scoop dough using a medium cookie scoop and roll each ball in the cinnamon sugar mixture.

Place on prepared baking sheets, spacing cookies about 2 inches apart.

Gently flatten each cookie using a cookie stamp or the bottom of a flat glass.

Bake for 10 to 12 minutes, until edges are lightly golden and centers are set.

Cool on the pan for 5 minutes, then transfer to a wire rack to cool completely.