Name: Anita's impossible buttermilk pie
Prep time: 10 min
Cook time: 35 min
Yield: 8
Cuisine: American
Ingredients: Cooking spray; 270g sugar; 240ml buttermilk; 100g biscuit mix (recommended: Bisquick); 80g unsalted butter, melted; 1 tsp vanilla extract; 3 large eggs; Confectioners' sugar and/or unsweetened cocoa powder, optional