Turn your slow cooker on high and slice butter into a 6 quart slow cooker
Cover and let sit for a few minutes so your butter can melt
Pour in your marshmallows and give them a stir to get the butter all over the marshmallows, cover and let it sit for 5 minutes while your marshmallows melt
Give your butter and marshmallows a good stir, cover for a couple more minutes
Stir your marshmallow and butter mixture until most of the lumps are gone
Add your cereal and stir until well coated
Spray a 9x13 pan with cooking spray and place your cereal mixture in it
Spray your hands with cooking spray and press your cereal mixture evenly into the pan
Pour your unwrapped Reese's cups into the same slow cooker, cover and cook for approximately 5 minutes
Stir your Reese's cups until mostly smooth
Spoon melted Reese's on top of your Rice Krispy Treats and spread with a knife until evenly distributed
Place them in the fridge to cool completely before cutting and serving
Notes
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As with any of our recipes, carb counts, calorie counts and nutritional information varies greatly. As a result, your nutritional content depends on which products you choose to use when cooking this dish. The auto-calculation is just an automated estimate and should NOT be used for specific dietary needs.
All slow cookers cook differently, so cooking times are always a basic guideline. Recipes should always be tested first in your own slow cooker and time adjusted as needed.