Preheat the oven to 375 degrees F.
To make the tortilla bowls, cut a 3-inch wedge from each tortilla and discard. Take a baking sheet and place a stainless steel mixing bowl upside down on the baking sheet. Brush 1 tortilla with 1 teaspoon of the olive oil and sprinkle with Essence. Drape tortilla over the bowl, pressing to form into a bowl shape. Bake until crisp, about 10 minutes. Cool on a wire rack and repeat with the remaining tortillas.
In a large skillet, cook the beef over medium heat, stirring, until browned, about 5 minutes. Strain the beef in a colander set over a bowl and discard the drained fat. Return the beef to the pan and add the onions. Cook, stirring occasionally, until the onions are soft, about 3 minutes. Add the tomato paste and garlic and cook, stirring, for 30 seconds. Add the chili powder, Baby Bam, and salt, stir, and add the chicken stock. When the broth is reduced by half, remove from the heat, about 1 minute. Let cool.
To assemble the salads, place 1 bowl, cup side up, on each of 4 plates. Spoon 1/2 cup of the ground beef mixture into the center of each bowl. Top with 1/2 cup of the shredded lettuce, 1/3 cup of the tomatoes, 2 tablespoons of the cheese, and the sour cream. Add salsa and guacamole, if desired, and serve.
Yield: 4 servings