Step 1

Preheat oven to 350°F.

Step 2

For the crust, combine biscoff cookies and salt in a food processor and pulse together to form crumbs. Add melted butter and pulse until incorporated. Press mixture tightly into the bottom and up the sides of a 9-inch round removable-bottom tart pan. Bake crust for about 15 minutes, until deeply golden and set. Cool crust for 10 minutes on a wire rack.

Step 3

For the filling, whisk together pumpkin, yogurt, heavy cream, egg, sugar, salt, cinnamon, ginger, and cloves in a medium bowl until smooth. Pour filling over cooled crust and smooth with an offset spatula.

Step 4

Return tart to oven and bake another 45 minutes, until a toothpick inserted in the center emerges mostly clean. Cool tart for 1 1/2 hours on a wire rack, then transfer to the refrigerator until chilled, about 2 hours.

Step 5

For the topping, combine brown sugar, butter, cream, and salt in a medium saucepan. Bring mixture to a boil, whisking until smooth. Remove from heat and whisk in vanilla. Let stand for 10 minutes before drizzling over tart and sprinkling with chopped pecans.