In a bowl, whisk the flour, sugar, cocoa powder and salt.
Add the melted butter and vanilla. Whisk until fully incorporated.
Add the egg and whisk until fully incorporated.
Spoon and spread the batter into a prepared pan. The batter is pretty thick!
Bake for 7 minutes.
Remove from the oven and poke some holes on the dough. Set aside and let it cool completely.
Once its cool, cut in half.
Scoop the softened ice cream onto the chocolate dough. You’ll use about 1 quart of ice cream. Using the back of a spoon, spread it into an even and thick layer.
Cover the entire pan with plastic wrap and freeze for at least 90 minutes.
Remove from the freezer. Using a sharp knife, cut into rectangles.
Serve immediately or wrap each one individually and store in the freezer.