Line a 13x9 baking dish with foil. Spread about 1 tablespoon butter in bottom of pan. Set aside.
In a large saucepan, melt butter over medium heat. Add marshmallows and stir constantly until smooth. Remove from heat and stir in cocoa powder. Fold in chocolate cereal and mix until fully combined. Spread in bottom of baking dish, pressing very gently. Set aside.
FOR THE MARSHMALLOW LAYER:
In a large mixing bowl, beat butter with powdered sugar, marshmallow cream and milk.
Beat for about 3 minutes until smooth. Spread evenly over the chocolate layer in the baking dish. Set aside.
FOR THE STRAWBERRY LAYER:
In a large saucepan, melt butter over medium heat. Add marshmallows and stir constantly until melted and smooth. Remove from heat.
Mix in the strawberry gelatin powder until combined. Fold in cereal. Spread gently over marshmallow layer. Cover with plastic wrap and allow to set, about one hour.
Cut into desired pieces.
Notes
If using regular (not sugar free) gelatin, use about 1 Tbsp powder.
Store in a covered container for about 3-5 days at room temperature.
Don't over mix your cereal into your melted marshmallows. You want to fold the cereal into the mixture by running your spatula from the outer side of the bowl (pan) to the center. Trying to get the sticky marshmallow from the bottom to the top. By overmixing, you're going to make crumbs of the cereal.
Always use parchment paper or foil in your baking dish. If using foil, make sure to spread a little butter on it so the treats don't stick. I usually use my empty butter wrappers to do this.
DON'T PRESS your krispie treats into the pan! You don't want rock hard treats. You want to gently, using your fingertips, spread the mixture into the pan. To keep my fingers from burning (and sticking), I run them in cold water (don't dry) and press gently. I repeat in the water if they start sticking. HOPE THIS HELPS!!
Start with fresh marshmallows. Stale mallows are hard to melt. I've tried, it doesn't work well. And it doesn't result in a chewy krispie treat