Preheat oven to 400°F.
In a large skillet, cook beef over medium heat 10-12 minutes or until no longer pink, breaking into crumbles; drain.
Add taco seasoning and water; bring to a broil.
Spoon meat into a greased 13x9-in. baking dish.
In a large bowl, beat eggs and milk. Stir in biscuit mix and pepper. Pour over meat.
Bake, uncovered, 20-25 minutes or until golden brown. Cool 5-10 minutes.
Spread sour cream over top; sprinkle with lettuce, tomato, green pepper, onions, and cheese.