Preheat oven to 350 degrees F. Line baking sheet with parchment paper. Set aside.

In a small bowl, sift together the flour and baking powder. Set aside.

Place 7oz. of the chocolate and the butter in a saucepan over low heat and stir gently until melted and smooth. Set aside.

Place the eggs, sugar and vanilla in the bowl of a stand mixer fitted with the paddle attachment and beat for 15 minutes or until pale and creamy.

Add in flour, baking powder, melted chocolate mixture, remaining 5 oz. of chocolate and mix to combine.

Set aside to to stand for 10 minutes.

Spoon 2 tablespoonful of the mixture, onto parchment lined bake sheet.

Bake for about 8–10 minutes or until puffed and cracked.

Cool completely on trays.

Beat butter with an electric mixer until smooth.

Add confectioners' sugar and beat again until smooth.

Add vanilla, caramel, and sea salt and beat to combine.

Spread approximately 1-2 tablespoon of filling onto one completely cooled cookie, then press another cookie on top to make a cookie sandwich.

Repeat until all cookies are made into sandwiches.

Enjoy!