Nutella-swirl skillet brownies! The secret to this oh so fudgy brownies are almond flour. So they're also accidentally gluten-free. Butter, sugar, eggs, cocoa powder, salt and vanilla of course but the intense chocolatey flavor comes from the addition of instant coffee and chocolate chips folded in. Use espresso if you prefer and speculoos if you don't need to be gluten-free. Full recipe at TheKitchn.