Combine cinnamon and remaining 3 tablespoons sugar and sprinkle on top. Bake pie until set and center is firm to touch, about 1 hour. Cool on a wire rack.
Just so you know, this pie is a SNAP to put together. It’s kind of a perfect dessert because you can throw it together and bake it before company comes over and then just let it sit in a cool window or in the fridge to chill while you enjoy dinner. Serve with coffee or hot tea. It’s soooo low maintenance.