Preheat the oven to 350°F (175°C) and prepare a 9" x 13" baking pan.

In a large mixing bowl, cream together ½ cup butter and 1 cup brown sugar until smooth. Add 1.75 cups flour and a pinch of salt, mixing until crumbly.

Press the crust mixture evenly into the prepared pan and poke holes with a fork.

Bake the crust for 28-32 minutes until golden brown.

In a separate bowl, whisk together 1 cup pumpkin puree, 2 eggs, ¾ cup granulated sugar, and 1 tablespoon pumpkin spice.

Pour the pumpkin filling over the slightly cooled crust and spread evenly.

Bake the bars for an additional 32-35 minutes until the filling is set.

Let the bars cool on a wire rack for at least 30 minutes before cutting.

For topping, mix 1 cup sour cream with ¼ cup confectioners’ sugar until smooth.