for the chocolate layer:
3 TBSP unsalted butter
1/2 teaspoon kosher salt
10 ounces marshmallows
1/2 teaspoon vanilla
1 cup semisweet chocolate chips
6 cups Chocolate Cheerios

for the drizzle:
1 cup peanut butter chips
1 cup semisweet chips

for the peanut butter layer:
3 TBSP unsalted butter
1/2 teaspoon kosher salt
10 ounces marshmallows
1/2 cup peanut butter
6 cups Peanut Butter Cheerios

topping:
8 ounces mini Reese's cups (the unwrapped kind)