1. Preheat the oven to 180°C (350°F).
2. In a mixing bowl, combine the grated cheese, sweet corn, and halved grapes. Mix well to ensure the grapes and corn are evenly distributed.
3. In a separate bowl, whisk together the egg and milk until well combined.
4. Gradually add the flour and a pinch of salt (if using) to the egg and milk mixture, stirring until it forms a smooth batter.
5. Gently fold the cheese, corn, and grape mixture into the batter until well coated.
6. Grease a muffin tin or mini cupcake tray with a little vegetable oil.
7. Spoon the mixture into the prepared muffin tin, filling each cup about three-quarters full.
8. Bake in the preheated oven for 20-25 minutes or until golden brown and a toothpick inserted in the center comes out clean.
9. Once baked, remove from the oven and allow to cool slightly before serving.

Summary:
These Grape and Corn Cheesy Bites are a nutritious and fun snack for toddlers. They provide a combination of essential nutrients from dairy, fruit, and vegetables, promoting healthy growth. The soft texture makes them easy for little ones to grasp and chew, catering to those practicing baby-led weaning. Store any leftovers in an airtight container in the refrigerator for up to 3 days. Reheat in the oven or microwave before serving. Always monitor for potential allergies, especially with grapes, as they can be a choking hazard; be sure to cut them appropriately.