Chimichurri Chicken on Ciabatta

Whole Wheat Ciabatta Bread ( Unbleached Untreated Whole Wheat Flour (Wheat Flour, Niacin, Reduced Iron, Thiamine Mononitrate, Riboflavin, Folic Acid), Water, Sea Salt, Yeast Malted Barley), Chicken Breast, Skinless, Boneless, Mayonnaise (Soybean Oil, Water, Whole Eggs and Egg Yolks, Distilled Vinegar, Salt, Sugar, Lemon Juice Concentrate, Calcium Disodium EDTA (Used to Protect Quality), Natural Flavors), Red Onion, Crumbled Feta Cheese ((Cultured Pasteurized Milk, Salt, Enzymes), Powdered Cellulose (to Prevent Caking), Natamycin (a Natural Mold Inhibitor)), Sunflower Oil, Arugula, Lemon Juice, Parsley, Cilantro, Rice Vinegar, Veg Base (Vegetables (Carrots, Onions, Celery), Water, Olive Oil, Tomato Paste, Potatoes, Nutritional Yeast, Porcini Mushroom Powder, Salt, Black Pepper), Garlic, Fresh, Lime Juice, Apple Cider Vinegar (Apple Cider Vinegar Reduced with Water to 5% Acidity), Jalapeno Pepper, Water, Municipal Tap, Evaporated Sugarcane Juice, Shallots, Dijon Mustard (Distilled White Vinegar, White Wine, Citric Acid, Tartaric Acid, Fruit Pectin, Sugar, Spices), Kosher Salt, Ground Black Pepper, White Pepper, Oregano, Dried, Leaves.