How can I adapt this recipe for a 9×13 baking pan? Hmm, Supraketo Keto Pills I’m not sure there would be enough batter to fill a 9×13 pan. I suppose you could try doubling the recipe - but I haven’t tested that myself. I followed the recipe to a T and my batter came out grainy! Why? It was smooth and delicious raw when I licked the spatula at the very end