Place a large skillet over medium-high heat. When hot, add oil and onions. Saute for about 5 minutes. Add ground beef and saute until browned, about 5 minutes. Drain off any excess fat. Add Tex Mex Seasoning Blend. Continue cooking 3 more minutes. Remove from heat. Add tomatoes and scallions. Season with salt and pepper.
Divide the meat onto 4 plates. Top each with 1 cup of lettuce, cheddar cheese, sour cream, and salsa. Garnish with cilantro sprigs.
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