01 - 
                Preheat the oven to 350°F (175°C) and position the rack in the center. Lightly grease mini loaf pans and line with parchment paper slings. For brownie pans, line 5 wells with 1-inch parchment strips extending over the edges.
              
              
              
                02 - 
                In a medium bowl, whisk together the egg, granulated sugar, brown sugar, pumpkin puree, canola oil, and vanilla extract until smooth.
              
              
              
                03 - 
                Sift or sprinkle the flour, baking powder, baking soda, pumpkin pie spice, and salt over the wet mixture. Gently whisk until fully combined with no dry streaks remaining.
              
              
              
                04 - 
                Distribute batter evenly into prepared pans. Sprinkle cinnamon sugar over the batter surface and carefully swirl the topping into the batter using a toothpick or knife, focusing on the top layer.
              
              
              
                05 - 
                Bake in the preheated oven: 20–23 minutes for brownie pans, 28–30 minutes for mini loaf pans, or until a toothpick inserted near the center comes out mostly clean. Cool in pans on a wire rack for 10–15 minutes before removing and cooling completely on the rack.