Make the Biscoff Crust

1. Prepare Crust Mixture: Place the crushed Biscoff cookies in a mixing bowl, and pour in the melted butter. Stir until the crumbs are evenly coated.
2. Form the Crust: Press the mixture firmly into the bottom and up the sides of a tart pan. Use the back of a spoon or a measuring cup to press it into an even layer.
3. Chill Crust: Place the crust in the refrigerator to set while you make the filling.

Make the Chocolate Ganache Filling

1. Heat Cream: In a small saucepan over medium heat, warm the heavy cream until it just starts to simmer. Remove from heat before it boils.
2. Combine with Chocolate: Place the chopped chocolate in a heatproof bowl, and pour the hot cream over it. Let sit for 1-2 minutes, then stir until smooth.
3. Add Cookie Butter and Flavoring: Stir in the Biscoff cookie butter, vanilla extract, and a pinch of sea salt until fully combined and silky.

Assemble the Tart

1. Pour Filling into Crust: Pour the chocolate ganache filling into the chilled Biscoff crust. Smooth the top with a spatula.
2. Chill the Tart: Refrigerate the tart for at least 3 hours or until the ganache is fully set.

Serve and Garnish

1. Add Garnishes: Just before serving, sprinkle extra crushed Biscoff cookies, shaved chocolate, or a dollop of whipped cream on top for decoration.
2. Slice and Serve: Cut into wedges and enjoy this decadent dessert with family and friends.