3/4 cup granulated sugar
2/3 cup light brown sugar
1/2 cup butter, softened
1 teaspoon vanilla extract
1 large egg
1 1/2 cups all-purpose flour (about 6 3/4 ounces)
1 teaspoon baking powder
1/2 teaspoon ground cinnamon
1/4 teaspoon salt
1/3 cup granulated sugar
1 1/2 teaspoons ground cinnamon
Preheat oven to 400F. Combine 3/4 cup granulated sugar, brown sugar, and butter in a medium bowl; beat with a mixer at medium speed until light and fluffy. Beat in vanilla and egg. Lightly spoon flour into dry measuring cups; level with a knife. Combine flour, baking powder, 1/2 teaspoon cinnamon, and salt, stirring well with a whisk.
Add flour mixture to butter mixture; beat just until combined. Shape dough into 30 balls. Combine 1/3 cup granulated sugar and 1 1/2 teaspoons cinnamon in a small shallow dish. Roll balls in sugar mixture, and place 2 inches apart on baking sheets coated with cooking spray.
Bake at 400F for 8 minutes or until tops crack. Cool on pans 1 minute. Remove from pans; cool on a wire rack.