1 cup Oreo crumbs (about 12 Oreos)

2 tablespoons salted butter, melted

1 ½ (8-ounce) packages (12 oz) full-fat cream cheese, room temperature

¼ cup light brown sugar, packed

¼ cup granulated sugar

1 tablespoon cornstarch (or 2 tablespoons all-purpose flour)

1 cup canned pumpkin purée

2 tablespoons sour cream or heavy cream, room temperature

1 teaspoon pure vanilla extract

1 teaspoon pumpkin spice

2 large eggs, room temperature

½ cup mini  chocolate chips

1 cup dark chocolate chips

½ cup heavy cream

1 cup heavy cream, chilled

⅔ cup powdered sugar

¼ cup unsweetened cocoa powder, sifted

½ teaspoon pure vanilla extract

Mini chocolate chips (for garnish)

Pumpkin decorations (for garnish)