Cook eggs according to your preferred doneness, set aside
Slice your croissants in half, set aside.
In small bowl heat your butter and brown sugar until sugar is dissolved, stir in your mustard.
Brush on one side of your croissant. Place about 4-5 slices of ham on bottoms of each of the croissants, top with a slice of cheese and top with 1/4 of your scrambled eggs.
Place your other half of the croissant on top and wrap in tinfoil.
Bake in oven for 10-15 minutes until cheese is melted.