Add chickpea flour, nutritional yeast, spices, and baking soda to a mixing bowl, stir until combined. Add dijon mustard and water, whisk until smooth.
Warm a skillet on medium-low heat, once warm add a splash (teaspoon) of avocado oil to the pan and then pour the chickpea batter on. *The batter is thin enough that it should naturally spread into a large circle, but smooth if needed with a spatula. While the chickpea omelet begins to cook, mince 1 garlic clove and grab a handful or so of spinach and add it to one side of the omelet.
After about 2-3 minutes (or once the omelet is bubbling, the sides are starting to appear firm and/or golden and a spatula easily slides under the bottom of it) flip the empty half onto the half that is now covered in spinach and garlic. Let cook for 1-2 minutes. Then, flip the folded omelet over and let it cook for one minute. Cover and shut off heat.
Leave covered for 3-5 minutes (this makes sure any batter inside of the omelet cooks), remove from pan and top with avocado, salsa (or Pico de Gallo), and hot sauce (optional). Enjoy!