S'mores Sheet Cake

Combine the dry ingredients in a large bowl. Whisk to remove any lumps.

Combine the wet ingredients and sugar.

Combine the wet and dry ingredients. Pour into pan and bake at 350F for 30-35 minutes.

Combine the ingredients for the graham cracker crumble.

Combine the ingredients for the marshmallow icing.

Spread the marshmallow icing over the cooled cake and sprinkle with graham cracker crumble.