If you have a bottle of Marshmallow Peanut Butter by Flavor Wizard collecting dust in your flavor collection - This is how to use it.
I know The Flavor Wizard is no more, but it's fairly easy to reproduce and actually improve it. SSA Peanut Butter and TFA MM 1:2 ratio
If you don't have any Marshmallow peanut butter, here's the alternative.
2% SSA PB
4% PUR MM or TFA MM
3% Pur NY Cheesecake or CAP NY Cheesecake
2% FLV White Chocolate ( can substitute for FLV Whipped Cream, SSA WC, FA WC )
1.5% FW Graham Cracker
0.50% CottonCandy or .50% super sweet - whatever.