Snickers Cupcakes

all-purpose flour ((1 3/4 cups))

cocoa powder ((1 cup))

baking soda

salt

full-fat buttermilk (at room temperature)

full-fat sour cream (at room temperature)

water (can substitute brewed coffee for richer flavor)

butter (at room temperature)

granulated sugar ((2/3 cup))

brown sugar ((2/3 cup))

large eggs (at room temperature)

vanilla extract

soft caramels

heavy cream

butter

salted peanuts (coarsely chopped)

butter (at room temperature)

creamy peanut butter ((1 1/4 cups))

vanilla extract

cream

powdered sugar ((4 cups))

marshmallow cream ((1 jar))

chocolate fudge sauce

salted peanuts (chopped)

fun-size Snickers bars (cut in half or coarsely chopped)