Spread a generous layer of marshmallow fluff around the inside rim of your glass. Fill the glass three-quarters full with ice.

In a separate mixing glass, combine peanut butter, light brown sugar, and a pinch of salt. Brew a shot of hot espresso over the mixture and stir vigorously until fully dissolved.

Pour the espresso mixture over the ice-filled glass. Add milk of your choice, filling the glass to the top while mixing thoroughly.

In a bowl, mix heavy cream, a splash of milk, marshmallow fluff, and a pinch of salt. Whip the mixture until thick and fluffy.

Spoon the fluffy cold foam generously on top of your latte and sprinkle Nutter Butter crumbs over the foam.