Imperial Stout Chocolate & Raspberry Beer Cream Whoopie Pies

Ingredients

• 4 and 1/4 cups (530g) all-purpose flour
• 1/2 tsp kosher salt
• 1 and 1/4 tsp baking powder
• 1 and 1/4 tsp baking soda
• 3/4 cup (85g) cocoa powder
• 1 cup (235ml) imperial stout
• 2 cups (400g) dark brown sugar, firmly packed
• 3/4 cup (175ml) vegetable oil (I used sunflower oil)
• 1 tsp espresso powder
• 1 egg, large
• 1 tsp vanilla extract
• 1/2 cup (120ml) buttermilk
• 1/2 cup (115g) unsalted butter, room temperature
• 1/2 cup (115g) cream cheese, room temperature
• 3 1/2 cups (390g) confectioners sugar, sifted
• 4 tsp (85g) seedless raspberry jam
• 2 Tbsp raspberry beer