s’mores cakes in ajar

S’mores Cake in a Jar makes 4 16-ounce mason jar cakes for crust: 1 1/2 cups graham cracker crumbs 1/2 stick butter pinch of salt for cake: 1 1/8 cups all purpose flour 1/4 cup dark cocoa powder 1 1/4 teaspoon baking soda 1/2 teaspoon salt 3/4 cup brown sugar…