Marshmallow without nuts corn cream

1 slice white bread 1 teaspoon margarine 1/2 teaspoon ground cinnamon 1/4 cup miniature marshmallows, or to taste[...]

1 1/2 cups miniature marshmallows 1 cup ice cubes 1/2 cup instant Swiss-style hot chocolate mix 1/2 cup whole milk 2 teaspoons white sugar[...]

3 tablespoons butter 1 teaspoon vanilla extract 4 cups miniature marshmallows 4 cups crisp rice cereal