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Preheat Oven: Set to 350°F. Place the chocolate crust on a baking sheet for stability.
Prepare the Brownie Batter: In a mixing bowl, combine the brownie mix, pumpkin puree, milk, oil, eggs, and pumpkin pie spice. Mix until smooth. The batter should be pourable but thick—adjust the milk for consistency.
Fill the Crust: Pour the brownie batter into the chocolate crust, spreading evenly. Leave a little space at the top to avoid overflow.
Bake: Bake for 30-40 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs. If the crust edges brown too quickly, cover them with foil.
Cool: Let the pie cool completely. For a firmer texture, chill in the refrigerator for 1-2 hours before serving.