Melt butter in non-stick pan. Add marshmallows and stir until melted. Add food coloring. Pull off heat and stir in cereal. Butter hands so cereal doesn’t stick. Take ½ to ¾ cup full of cereal treat in hand, flatten slightly, and then place peanut butter cup in the middle. Wrap cereal around the chocolate and add a pretzel half on the top to make the pumpkin stem. Enclose the top while shaping the cereal into a pumpkin shape. Flatten or roll tootsie roll candy until thin and cut out eyes, nose and mouth pieces for jack-o-lanterns. Stick onto pumpkin and serve.