Preheat oven to 350 degrees F.

Spray a 12-cup muffin pan with cooking spray.

In a large bowl, whisk eggs. Mix in cheese, chives, salt and pepper.

Place egg mixture in muffin cups, dividing evenly. (About 1/4 cup per muffin cup)

Bake eggs for 15 minutes.

Using a biscuit cutter, cut out 24 circles of bread and 12 slices of ham.

Remove eggs from oven and let cool for 5 minutes. Remove from pan.

Place ham and egg on bread and top with bread.

Top each sandwich with a slice of tomato. Use toothpick or wooden skewer to secure sandwich.

I like to spread Dijon mustard on one slice of bread for each sandwich.