Preheat oven to 350F. Line cookie sheets with parchment or a silpat baking mat.
Whisk flour, baking powder, and salt in a medium bowl. Set aside.
Cream butter, peanut butter, and 3/4 cup granulated sugar, and brown sugar in a mixer until fluffy. Mix in eggs, vanilla, and 1 teaspoon cinnamon. Mix in dry ingredients. Beat just until mixed.
Stir remaining 1 teaspoon cinnamon and 1/3 cup sugar in a small bowl.
Scoop balls of cookie dough (mine were done using a 2 tablespoon cookie scoop) and roll them in the cinnamon sugar. Place on your cookie sheet. Use a fork to press the cookie down in a criss-cross pattern (two presses will be enough).
Bake cookies for 10-12 minutes. Cool slightly before removing from cookie sheets.