01 -
Line an 8x8 inch pan with parchment paper or aluminum foil. Lightly spray with non-stick cooking spray to prevent sticking.
02 -
In a heatproof bowl over simmering water, combine semi-sweet and milk chocolate chips with butter. Stir consistently until melted and smooth.
03 -
Whisk in sweetened condensed milk and hot chocolate powder until fully combined and smooth.
04 -
Stir in vanilla extract once the mixture is uniformly melted.
05 -
Gently fold 2 cups of mini marshmallows into the chocolate mixture.
06 -
Pour the mixture into the prepared pan. Evenly sprinkle remaining 1 cup of mini marshmallows on top and lightly press them into the surface. Cover and refrigerate for 4 to 5 hours until set.
07 -
Using a large sharp knife warmed in hot water and dried, cut fudge into small squares for clean edges.