Preheat the oven to 325 degrees Fahrenheit. Lightly grease a 9x13 inch pan or line it with parchment paper.

In a mixing bowl, whisk together the flour, cinnamon, baking powder, and salt.

In a separate bowl, beat the softened butter and sugar until creamy. Add the egg and vanilla extract, and mix well.

Gradually add the dry ingredients to the wet ingredients, mixing just until combined. Stir in the chopped pecans.

Press the dough evenly into the prepared pan. Mix the 3 tablespoons sugar and 2 teaspoons cinnamon and sprinkle evenly over the top.

Bake for 16 to 18 minutes, until the edges are lightly browned. Let cool in the pan for 15 minutes before cutting into squares.

Transfer to a wire rack to cool completely. Serve and enjoy!