1Heat oven to 350°F. Spray 9x5-inch loaf pan with cooking spray. In 12-inch skillet, cook beef and taco seasoning mix 5 to 7 minutes over medium-high heat, stirring occasionally, until beef is thoroughly cooked. Separate each can of dough into 8 biscuits; cut each into quarters. In large bowl, toss biscuit pieces with cooked beef and cheese. Pour into loaf pan.
2Bake 35 minutes or until dark golden brown. Cool 5 minutes.
3Meanwhile, in medium bowl, toss avocado, tomato, onion, cilantro, lime juice, salt and pepper. Place lettuce on serving plate. Invert bread onto plate over lettuce. Top with sour cream and tomato-avocado mixture. Serve immediately.