Pannukakku, or Finnish oven pancake, is a delightfully light and fluffy baked pancake that is simple to prepare and perfect for breakfast or dessert. This recipe features a soft, custard-like texture with the delicate sweetness of vanilla and caster sugar, baked to golden perfection. For a more indulgent experience, serve it with optional mascarpone cream and poached rhubarb, adding creamy richness and tart fruitiness that complement the pancake beautifully.