Place on 2 table spoon of butter in a deep skillet over medium heat. Add shallots, celery and peppers and saute until soft.
Next add garlic and flour and stir to coat, saute for an addition 2 minutes.
Now add vermouth, stir, followed but yogurt, red pepper flakes, parsley, salt and pepper . Reduce heat, cover and simmer for about 15 minutes.
While sauce in simmering, place a non stick skillet over medium high heat.
Roll scallops in melted butter and sear for about 1 to 2 minutes on each side and place 2 sear scallops in each bowl, now uncover sauce, stir, add oysters, simmer for 2 to 3 minutes, then continue with scallops until done.