Preheat the oven to 400 degrees Fahrenheit.

In a large bowl, beat eggs with whole milk, cheddar cheese, Dijon mustard, salt, and pepper. Then add the two pieces of bread to the egg mixture (cut the bread in 1x1 pieces). Mix well with a spoon then add the cubed ham and biscuits to the egg mixture. Using an oven-proof 9x9 glass casserole dish-- spray with cooking spray. Then add the egg mixture to the casserole dish. Bake in the oven for 30 minutes at 400 degrees.

Remove from the oven and serve immediately.