In an iron skillet, saute onion and celery in oil. Add bay leaves, thyme, lemon-pepper seasoning and House Seasoning. Pour in stock and add tomatoes and okra. Cover pot and gently simmer for 30 minutes. Remove from heat and stir in shrimp.
To prepare the topping, preheat oven to 400 degrees F. Mix together egg and milk, add to muffin mix, and combine until just well-blended. Drop by tablespoonfuls on top of hot shrimp mixture, leaving the center uncovered. Bake 15 to 20 minutes.
Mix ingredients together and store in an airtight container for up to 6 months.
This Southern dish usually is prepared and served in an iron skillet, but may be cooked in a frying pan with an ovenproof handle.