Preheat oven to 425°F. In 12” non-stick pan, heat 2 tablespoons olive oil on medium-high heat; add chorizo and cook for 5 minutes. Add onion; cook an additional 5 minutes, until flavors are combined. Remove from heat; stir in mushrooms and pimientos and set aside in large bowl; reserve pan for later.
Meanwhile, in a separate large pan, heat corn oil over medium heat. Once hot, add potatoes in small batches; do not overcrowd the pan. Fry potatoes for about 5 minutes, until they are cooked, but are not browned. Drain on paper towel.
In a large bowl, whisk eggs together and season with Adobo. Add chorizo mixture and potatoes, mix well, and add chopped parsley.
In reserved pan, heat remaining 1 tablespoon olive oil over medium heat until hot but not smoking. Add egg mixture to pan and cook until bottom and sides of eggs begin to become firm and underside becomes light golden brown. (If underside of egg mixture is browning too fast, reduce heat to medium-low). Run thin spatula along edge of pan to separate egg mixture from sides.
Place pan in oven and cook for 15 minutes. To check tortilla, press lightly in the middle and make sure it is firm. When done, turn over onto a large plate or platter. Cut into pieces, and serve either hot or at room temperature.