Add 1 cup of milk, SunButter, and fruit jam to a blender and blend until cohesive. Blending ensures that your SunButter and jam are well incorporated into the mix and you won't end up with any chunks.
Transfer the mixture to a small saucepan over medium-low heat. Whisk in the cocoa, sugar, and salt, and whisk until all three have dissolved.
Whisk in the rest of the milk until well-blended and until the mixture it steamy and hot. Stir the vanilla in, and transfer the hot cocoa to mugs. (If you find the mixture too thick, simply whisk in more milk.)
Top with your favorites, like whipped cream and marshmallows, and drizzle with some SunButter and jam for extra goodness.