Step 1: Preheat your oven to 350°F (175°C) and line your muffin tin with paper liners or grease it lightly.
Step 2: In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, baking soda, and salt until well combined.
Step 3: In another bowl, mix the ube puree, eggs, milk, vegetable oil, and vanilla extract. Whisk until the mixture is smooth.
Step 4: Pour the wet ingredients into the dry ingredients. Gently fold them together using a spatula until just combined. Be careful not to overmix; a few lumps are okay.
Step 5: Scoop the batter into the prepared muffin tin, filling each cup about two-thirds full.
Step 6: Place the muffin tin in the preheated oven and bake for 18-22 minutes, or until a toothpick inserted into the center comes out clean.
Step 7: Once baked, remove the muffins from the oven and let them cool in the pan for about 5 minutes. Then, transfer them to a wire rack to cool completely.