In a large bowl, beat eggs and milk together until combined, then stir in biscuit mix, and salt and pepper, if using. Set aside.
Season beef with salt and pepper, then cook until browned. Drain fat, then stir in taco seasoning.
Place beef in an even layer in greased baking dish, then spread biscuit mix in an even layer on top of beef.
Transfer baking dish to oven and bake until biscuit layer is golden brown, 22-25 minutes.
Remove from oven and let cool 10 minutes, then spread sour cream on top of biscuits.
Top with chopped lettuce, tomatoes and olives, if using, then sprinkle cheddar cheese on top.
Serve hot and enjoy!
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