6 tablespoons (84 g) unsalted butter, chopped
2 ounces bittersweet chocolate, chopped
1 1/2 cups (225 g) chocolate gluten free cookie crumbs
2 cups (400 g) sugar
1/2 cup (4 fluid ounces) water
1/4 teaspoon cream of tartar
3/4 cup (6 fluid ounces) heavy whipping cream
2 tablespoons (28 g) unsalted butter, chopped
3 ounces bittersweet chocolate, chopped
1 teaspoon pure vanilla extract
Line a standard 12-cup muffin tin with greaseproof liners. Set the pan aside.
Make the crust. Place the butter and chocolate in a small, heat-safe bowl over a pot of simmering water (making sure the bowl does not touch the water, and the water does not boil). Stir until almost melted. Remove from the heat and continue to stir until both the butter and the chocolate are melted and smooth.
In a large bowl, mix the cookie crumbs with the melted butter and chocolate until well-combined. Divide the mixture among the muffin liners in the tin, and press into the bottom. Cover the bottom of a juice glass with plastic wrap, and press it into the bottom center of each muffin liner to compress the cookie crumb mixture and press it up the sides of the liners a bit. Place the muffin tin in the freezer until the crusts are firm (at least 10 minutes, but longer is fine).
Make the filling. Place the sugar, water and cream of tartar in a medium-size, heavy-bottom saucepan and whisk to combine. Cook, undisturbed, over medium-high heat until the sugar begins to turn amber-colored around the edges and reaches about 300°F. Remove the saucepan from the heat, stir to prevent the sugar from burning, and add the heavy cream. The mixture will bubble up quite a lot. Stir until the bubbling subsides. The sugar may seize up, but it will melt again. Add the chopped butter and chocolate, and stir to combine. Return the saucepan to the heat and cook undisturbed, over medium-high heat, until the mixture reaches 245°F. Remove from the heat and whisk in the vanilla. Pour the mixture immediately into the muffin cups, on top of the cookie crumb crust, about 3/8-inch above the crusts.
Allow the cups to sit at room temperature until the filling is set (about 1 hour). Store any leftover chocolate caramel in a heat-safe container. It will become firm, but can be softened by either placing in the microwave for 30 seconds, or in a simmering pot of water until smooth.
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