Preheat oven to 350 degrees. Lightly grease a shallow ovenproof bowl. Slice croissant in half and place in bowl. Sprinkle each croissant bottom half with ham, 1/4 cup Swiss cheese and the other cheeses. In a medium bowl, whisk the egg, milk and seasonings. Pour over the croissant and cheeses. Replace top of croissant. Sprinkle with the remaining Swiss cheese. Bake about 20-25 minutes, or until the eggs are set and the croissants are golden brown.