Follow these step-by-step instructions carefully to ensure your Ube Puto Cups are perfectly fluffy, moist, and delicious every time. The process is divided into preparation, mixing, and steaming for clarity.

Part 1: Preparation

1. Prepare the Steamer: Fill the bottom of your steamer with water, ensuring it’s about two-thirds full. Place it over medium-high heat and bring it to a rolling boil. Having the steamer hot and ready is crucial for a good rise.
2. Grease the Molds: Lightly grease your individual puto molds or mini muffin tins with a neutral oil or non-stick spray. This will prevent the delicate cakes from sticking and ensure they release easily after steaming. Set them aside.
3. Prepare the Cheese: Cut your quick-melt cheese into small cubes, approximately ½-inch in size. Having these ready will make the assembly process smoother.

Part 2: Creating the Perfect Batter

1. Sift the Dry Ingredients: In a large mixing bowl, place a fine-mesh sieve. Add the cake flour, granulated sugar, baking powder, and salt. Sift them together into the bowl. This step is non-negotiable; it aerates the flour and removes any lumps, which is essential for a smooth batter and a fluffy final product. Whisk the sifted ingredients together to ensure they are evenly distributed.
2. Combine the Wet Ingredients: In a separate medium-sized bowl, whisk together the wet ingredients. Start by whisking the two large eggs until they are pale and slightly frothy. Add the melted butter, full-fat coconut milk, ube halaya, and ube extract. Whisk vigorously until the ube halaya has dissolved and the mixture is smooth and uniform in its vibrant purple color. It’s okay if there are a few tiny specks of ube jam remaining.
3. Combine Wet and Dry: Pour the wet ingredient mixture into the bowl with the sifted dry ingredients. Using a rubber spatula or a whisk, gently fold the ingredients together. Mix only until there are no more visible streaks of dry flour. It is critically important not to overmix the batter. A few small lumps are perfectly fine. Overmixing develops gluten, which will result in tough, dense puto instead of light, fluffy ones.

Part 3: Steaming to Perfection

1. Fill the Molds: Carefully pour or spoon the ube puto batter into your prepared molds. Fill each mold about three-quarters of the way full. This leaves enough room for the puto to rise and form its classic dome without spilling over.
2. Add the Cheese Topping: Place one cube of the prepared cheese in the center of the batter in each mold. Gently press it down just slightly, but don’t submerge it completely.
3. Steam the Puto: By now, your steamer should be producing a steady amount of steam. Carefully arrange the filled molds inside the steamer basket, ensuring they are not touching each other to allow for even steam circulation.
4. Wrap the Lid: To prevent water condensation from dripping onto your puto (which can cause them to become dense and soggy), wrap the steamer lid with a clean kitchen towel or a few layers of cheesecloth.
5. Steam: Place the towel-wrapped lid on the steamer. Steam the puto for 10 to 15 minutes. The exact time will depend on the size of your molds and the intensity of your steamer.
6. Check for Doneness: After 10 minutes, you can check for doneness. Carefully remove the lid (opening it away from you to avoid a steam burn) and insert a toothpick into the center of one puto cup. If the toothpick comes out clean, they are done. If there is wet batter on it, steam for another 2-3 minutes and check again.
7. Cool and Serve: Once cooked, carefully remove the steamer basket from the pot. Let the puto cups cool in the molds for about 5 minutes. This allows them to set and makes them easier to handle. Afterwards, you can gently remove them from the molds and transfer them to a wire rack to cool further. They are best enjoyed warm.