Pour this 1 mixture over fluffy marshmallows into a slow cooker for a shareable dessert that disappears fast

Ingredients
2 cups mini marshmallows (or 16 large marshmallows)
1 1/2 cups heavy cream
2 cups dark chocolate chips (about 12 ounces, 60–70% cacao)
2 tablespoons unsalted butter
2 teaspoons pure vanilla extract
Pinch of kosher salt (optional, but recommended)
Directions
Prepare the slow cooker: Lightly coat the inside of a 3- to 4-quart slow cooker with nonstick spray or a thin film of neutral oil to help prevent sticking and make cleanup easier.
Add the marshmallows: Spread the mini marshmallows (or large marshmallows, torn in half) evenly over the bottom of the slow cooker. They should form a fluffy layer that the chocolate mixture will melt into.
Make the 1 chocolate mixture: In a medium saucepan, combine the heavy cream, dark chocolate chips, butter, vanilla extract, and a pinch of kosher salt if using. Set the pan over low to medium-low heat.