Crockpot S'mores Brownies

10 T. butter
1/3 c. milk chocolate chips
1 c. extra fine sugar
2 eggs
2 t. vanilla
3/4 c. plain flour
1/4 t. salt
2 T. cocoa
16-18 individual graham crackers
2 c. milk chocolate chips
3 c. miniature marshmallows

Line crockpot with aluminum foil. Melt chocolate and butter in microwave or saucepan until smooth. Cool slightly. Beat eggs and vanilla with sugar. Add in chocolate mixture until well combined. Combine cocoa, flour and salt. Add to rest of batter. Do not overmix. Pour half of batter in crockpot. Top with graham crackers, piecing together at edges to fit and fully cover brownie batter. Sprinkle chocolate chips on top. Top with remaining batter. Cover. Cook on low for 1 1/2 hours. Tops will look like they are undercooked. Pulling on foil will help determine doneness. If brownies lift easily without buckling, remove from crockpot and allow to cool. If they buckle, bake 15 more minutes, check again, and remove. Once cooled, top with marshmallows and place under oven broiler for 30-60 seconds until toasted. Be sure to watch closely as marshmallows burn quickly! Remove from oven, cut, serve, and enjoy!