Get Ready to Bake! First, warm up your oven to 425°F (220°C). Grab a 9-inch tart pan with a removable bottom and lightly spray it with non-stick cooking spray for super easy release later.
Whip Up the Healthy Crust: In a big mixing bowl, whisk together the all-purpose flour, unsweetened dark cocoa powder, white sugar, and 1/2 teaspoon kosher salt. Pour in the melted unsalted butter and stir until the mixture forms a lovely crumbly dough. This rich, dark crust is a delicious and simple base!
Bake the Perfect Base: Gently press your chocolate dough evenly into the bottom and up the sides of your prepared tart pan. Place the pan on a baking sheet to catch any tiny drips and bake in your preheated oven for just 10 minutes. This quick pre-bake helps ensure a firm, non-soggy crust! Remove the crust and let it cool for about 10 minutes while you prepare the filling.
Mix the Creamy Pumpkin Filling: While the crust cools, grab a clean mixing bowl. Whisk together the pure pumpkin, sweetened condensed milk, large egg, pumpkin pie spice, and 1/4 teaspoon kosher salt until everything is super smooth and perfectly combined. This mixture will become the rich, naturally spiced heart of your tart.
Fill and Bake to Golden Perfection: Carefully pour the pumpkin filling into your cooled chocolate crust. Pop it back into the oven at 425°F (220°C) for just 10 minutes. Then, lower the oven temperature to 350°F (175°C) and continue baking for another 25-30 minutes, or until the filling is set with a slight jiggle in the center. A toothpick inserted should come out clean.
Chill and Enjoy: Let your beautiful tart cool completely in the pan for at least 1 hour at room temperature. This crucial step allows the filling to set perfectly. Once cooled, slice and enjoy this naturally flavorful and satisfying dessert! For an extra touch, a light dollop of whipped cream or a sprinkle of cinnamon is always a treat.