01 - Cook ground beef in a skillet to 160°F, drain fat and stir in the measured seasonings. Warm beans separately.
02 - Warm four tortillas until pliable. On two bases divide beans, beef, tomato sauce, cheese, tomatoes and optional olives. Use only what fits in a manageable layer and serve excess separately.
03 - Cover each with a second tortilla. Toast over medium-low heat, turning with broad spatulas until both sides are golden and cheese melts.
04 - Top with lettuce, sour cream and scallions after cooking, then cut into wedges.