Spicy Hot Chocolate Pie

1 1/2 - 2 cups gingersnap crumbs

6-8 tablespoons melted butter

For the chocolate filling:

7 ounces dark chocolate, chopped

1 cup heavy cream

1 egg (at room temperature)

1/8 teaspoon ground ginger

1/8 teaspoon cinnamon

1/8 teaspoon cayenne pepper (or to taste)

Pinch of salt

For the cinnamon whipped cream:

1 1/2 cups heavy cream

1/4 cup sugar

1 teaspoon cinnamon

Pinch of chili flakes