Preheat oven to 400 degrees F. Mist a pie pan with olive oil cooking spray and set aside.
In a nonstick skillet, heat olive oil over medium heat. Once hot, add the onion and cook 4-5 minutes or until softened. Add the chorizo and cook until hot, breaking up with a wooden spoon. Add spinach and allow to wilt, stirring often. Remove from heat and allow to cool.
In a large bowl, beat the eggs with the salt and pepper.
Arrange the spinach and chorizo mixture on the bottom of the pie pan, covering the entire surface. Slowly pour the eggs over the top and bake for 40-50 minutes or until golden around the edges and the center is fully cooked. Allow to cool for 5 minutes before slicing and serving.
Notes
*use MSG and sugar-free chorizo to be Whole30 and Paleo compliant