First, heat oil in a large skillet over medium-high heat.
Add ground beef and mix well breaking it apart with a wooden spoon to crumble. Cook until browned about 5-7 minutes.
Once browned, sprinkle with the taco seasoning and stir well to combine. Remove from the heat and allow to cool at room temperature.
Meanwhile, tear the lettuce into large pieces and dice the tomatoes and avocados into 1-inch pieces.
Next, in a large salad bowl, combine, lettuce, tomatoes, onion, avocado, cheese, corn, black beans, and crushed tortillas if using.
In another small mixing bowl, whisk together all the creamy dressing ingredients.
Add the chilled cooked beef to the salad and drizzle dressing on top.
Prior to eating toss well and enjoy!