Heat oven to 350. Heat large skillet over medium heat. Add beef. Cook beef, stirring frequently to crumble, until cooked through and no longer pink. Add taco seasoning and 1 c. water. Bring to a boil. Reduce heat; simmer 10 minutes or until thickened. While taco meat is simmering, combine beans and salsa in a blender. Blend until smooth. Place 6 tortillas on a baking sheet. Bake 12-15 minutes or until crispy but not browned. Remove from oven, and remove tortillas from baking sheet. Add 6 more tortillas to baking sheet and bake 12-15 minutes or until crispy. While the second set is baking, top first 6 tortillas with bean mixture (about 3 tablespoons on each one). Top with remaining tortillas. Top “sandwiches” with taco meat (about 1/2 c. each), shredded cheese, lettuce, olives, and avocado. Top with diced tomatoes. Top with additional salsa and sour cream, if desired.