1. Saute the onions in a pan until they are soft.

2. Lightly toast the bread.

3. Place half of the cheddar cheese on one slice of bread.

4. Spread the onions evenly over the cheese.

5. Place the ham on top of the onions.

6. Sprinkle the remaining cheddar cheese over the ham.

7. Top with the other slice of bread and press lightly.

8. Grill the sandwich in a pan or sandwich maker until the cheese is melted and the bread is crispy.

9. Serve and enjoy!