Prep Time 20 minutes mins
Cook Time 18 minutes mins
Resting Time 30 minutes mins
Total Time 1 hour hr 8 minutes mins
For best flavor, use ripe, good-quality guava products and make sure all refrigerated ingredients are at room temperature so the batter emulsifies smoothly and bakes evenly; avoid overmixing once the flour is added to keep the cupcakes tender, and check doneness a minute or two early since guava sugars can encourage quicker browning—if you prefer a stronger guava taste, swirl a tiny spoonful of guava jam into the center of each cupcake before baking or brush the tops with warm guava nectar while still slightly warm, and store the finished cupcakes in an airtight container at cool room temperature for up to one day or refrigerate for longer, bringing them back to room temperature before serving for the best texture.