Rinse the glutinous rice thoroughly under cold running water until the water runs clear. Transfer the rinsed rice to a large bowl and cover with fresh cold water. Let it soak for a minimum of 2 hours, or ideally 4 hours, or even overnight for best results. Drain the soaked rice very well before proceeding.

Prepare your steamer: fill the bottom pot with water and bring it to a boil. Line the steamer basket with a clean cheesecloth or parchment paper. Place the drained glutinous rice evenly in the lined steamer basket. Steam over the boiling water for 25-30 minutes, or until the rice is tender, translucent, and slightly chewy. If using a rice cooker, follow the manufacturer's instructions for cooking sweet/glutinous rice.

While the rice is steaming, combine the full-fat coconut milk, granulated sugar, and salt in a small saucepan. Heat the mixture over medium heat, stirring continuously until the sugar completely dissolves and the sauce comes to a gentle simmer. Do not allow it to boil vigorously. Remove from heat. If you prefer a slightly thicker sauce, mix the cornstarch with 2 tablespoons of water to create a slurry, then whisk it into the simmering coconut milk and cook for an additional minute until it slightly thickens.

Once the sticky rice is cooked, transfer it immediately to a large mixing bowl. Pour approximately 3/4 of the prepared sweet coconut sauce over the hot rice. Gently fold and stir the rice to ensure every grain is coated evenly with the sauce. Cover the bowl and let it sit for 15-20 minutes. This allows the rice to absorb the sauce fully, becoming tender, glossy, and perfectly sweet. Reserve the remaining coconut sauce for serving later.

While the rice is absorbing the sauce, peel the ripe mangoes. Carefully slice the mango flesh into thin, even strips or small sticks, ensuring they are suitable for rolling.

Set up your rolling station: have a shallow dish filled with warm water for softening the rice paper wrappers. Keep your bowl of prepared sticky rice, the sliced mangoes, and a clean, flat surface (such as a large cutting board or a clean plate) within easy reach. Also, line a baking sheet with parchment paper for the finished rolls.

Take one rice paper wrapper and dip it into the warm water for about 15-20 seconds, or until it becomes soft and pliable, but not overly limp. Lay the softened wrapper flat on your clean working surface. Place a small amount (about 2-3 tablespoons) of the sweet sticky rice in a horizontal line across the bottom third of the rice paper, leaving some space on the sides. Arrange a few mango slices on top of the sticky rice.

Fold the bottom edge of the rice paper tightly over the filling. Then, fold in the left and right sides of the wrapper. Carefully and tightly roll the wrapper from the bottom upwards, creating a compact spring roll shape. Place the finished roll onto the parchment-lined baking sheet, ensuring the rolls do not touch each other to prevent sticking. Repeat this process with the remaining rice paper, sticky rice, and mango slices.

Prepare two shallow dishes for the coating. In the first dish, whisk together the all-purpose flour and 0.5 cup water until you have a smooth, lump-free batter. In the second shallow dish, place the panko breadcrumbs.

Carefully take each assembled sticky rice roll and dip it first into the flour batter, ensuring it's fully coated. Let any excess batter drip off. Then, transfer the roll to the panko breadcrumbs, gently pressing and rolling to adhere the crumbs evenly over the entire surface. Place the fully coated rolls back onto the parchment-lined tray.

Choose your preferred cooking method:

Deep Frying: Heat 3-4 cups of vegetable oil in a large skillet or deep pot over medium-high heat until it reaches 350°F (175°C). Carefully fry the rolls in batches for 2-3 minutes per side, or until they are uniformly golden brown and wonderfully crispy. Remove the fried rolls with tongs and place them on a wire rack set over paper towels to drain any excess oil.

Air Frying: Preheat your air fryer to 375°F (190°C). Lightly spray the coated rolls with cooking spray. Arrange the rolls in a single layer in the air fryer basket, ensuring not to overcrowd it. Air fry for 10-12 minutes, flipping the rolls halfway through, until they are golden brown and crispy.

Baking: Preheat your oven to 400°F (200°C). Place the coated rolls on a parchment-lined baking sheet. Lightly spray them with cooking spray. Bake for 15-20 minutes, flipping halfway through, until they are golden and crispy.

Allow the cooked rolls to cool slightly for a few minutes before serving. Serve them warm, drizzled generously with the reserved sweet coconut sauce and garnished with toasted sesame seeds and fresh mint leaves, if desired. Enjoy the perfect blend of crispy exterior and sweet, creamy interior!