Dutch Oven Fudge

Another recipe I got from Mom's collection, but I haven't tried it in the dutch oven. 1 can evaporated milk 5 cups sugar 1 1/2 tsp. vanilla 1/2 lb. butter Mix and boil. After it comes to a boil, add: 1 (12 oz.) pkg. chocolate chips 1 (16 oz.) pkg. mini marshmallows Let boil 8 minutes or until thick. Remove from heat. Leaving in dutch oven, stir until it loses gloss. Pour into large cake pan that has been buttered, cool, and cut.