Preheat the Oven: Preheat your oven to 350°F (175°C) so it’s nice and hot when the bars go in.

Mix Wet Ingredients: In a large mixing bowl, combine the softened butter and sugar, blending them until they’re well mixed and creamy. Then, add the pumpkin puree and eggs, mixing until smooth.

Combine Dry Ingredients: In a separate bowl, whisk together the flour, baking soda, cream of tartar, ground cinnamon, and salt.

Mix Everything Together: Gradually add the dry ingredients to the pumpkin mixture, stirring until you have a thick, smooth batter.

Prepare the Baking Dish: Grease a 9×13-inch baking dish to ensure the bars won’t stick.

Spread the Batter: Pour the batter into your greased baking dish, spreading it evenly.

Cinnamon Sugar Topping: In a small bowl, mix the sugar and ground cinnamon for the topping. Sprinkle this mixture evenly over the top of the batter.

Bake: Place the baking dish in your preheated oven and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.

Cool and Serve: Allow the bars to cool in the pan before slicing them into squares. Serve them warm for an extra treat!