According to the Taco Bell, website, these are ingredients for their apple empanada. Note that it is not vegan.

Caramel Apple Empanada*
Enriched Flour (Wheat Flour, Niacin, Reduced Iron, Thiamine Mononitrate, Riboflavin, Folic Acid), Water, Apples (Apples, Salt, Ascorbic Acid, Citric Acid), Vegetable Shortening (Partially Hydrogenated Soybean and Cottonseed Oil), Brown Sugar, High Fructose Corn Syrup, Food Starch-Modified, Non Fat Dry Milk, Contains 2% or less of the following: Margarine (Soybean Oil, Water, Mono and Diglycerides, Salt, Whey, Soy Lecithin, Sodium Benzoate, Artificial and Natural Flavor, Vitamin A Palmitate, Beta Carotene Color), Tapioca Dextrin, Dextrose, Sugar, Maltodextrin, Salt, Rice Flour, Dicalcium Phosphate, Sodium Alginate, Sodium Citrate, Sodium Bicarbonate, Locust Bean Gum, Xanthan Gum, Soy Lecithin, Agar, Carboxymethylcellulose, Carrageenan, Caramel Color, Natural and Artificial Flavor. Oil: High-Oleic Low-Linolenic Canola Oil, TBHQ (To Protect Flavor), Dimethylpolysiloxane (An Antifoaming Agent). CONTAINS: WHEAT, MILK, SOYBEANS

Water, Enriched Flour (Wheat Flour, Niacin, Reduced Iron, Thiamin Mononitrate, Riboflavin, Folic Acid), Apples, High Fructose Corn Syrup, Shortening (Partially Hydrogenated Soybean and/or Cottonseed Oil With TBHQ And Citric Acid To Protect Flavor), Modified Food Starch, Sugar, Brown Sugar, Canola Oil With TBHQ (Preservative). Contains 2% Or Less Of: Ascorbic Acid, Baking Soda, Caramel Color, Cellulose Gum, Citric Acid, Dextrin, Dextrose, Dough Conditioner (Sodium Metabisulfite), Maltodextrin, Margarine (Palm Oil, Soybean Oil, Salt, Mono- and Diglycerides, Annatto Color, Calcium Disodium EDTA [Preservative], Artificial Flavors, Vitamin A Palmitate), Natural and Artificial Flavor (Natural and Artificial Flavor, Flour, Sugar, Cornstarch, Unsalted Butter, Salt, Soy Lecithin, Dextrose, Polysorbate 80, Xanthan Gum, Annatto Color), Nonfat Dry Milk, Salt, Whey, Xanthan Gum. Oil: High-Oleic Low-Linolenic Canola Oil, TBHQ (To Protect Flavor), Dimethylpolysiloxane (An Antifoaming Agent). CONTAINS: WHEAT, MILK, SOYBEANS

*Will Contain One Of The Ingredient Statements Above, Depending Upon Regional Suppliers

Churro
Their Churro also is not vegan.

Water, Wheat Starch, Corn Flour, Vegetable Oil (Contains One Or More Of The Following: Canola Oil, Corn Oil, Cottonseed Oil, Palm Oil, Soybean Oil), Egg Yolks, Modified Food Starch, Egg Whites, Sodium Caseinate, Leavening (Sodium Acid Pyrophosphate, Sodium Bicarbonate, Sodium Aluminum Phosphate), Salt, Nonfat Dry Milk, Buttermilk, Artificial Flavor, Rice Flour, Maltodextrin, Wheat Flour, Tapioca Dextrin, Mono And Diglycerides, Soy Flour, Caramel Color, Guar Gum, Xanthan Gum. CONTAINS: WHEAT, EGGS, MILK, SOYBEANS

Taco Shell
Here are the ingredients for Taco Bell’s taco shell.

Water, Ground Corn Treated With Lime, Sodium Propionate (Propionic Acid, Sodium Hydroxide), Methylparaben And Propylparaben, Cellulose Gum.

They state:

We do offer meatless options, but none of our products are certified as vegetarian. Please note that in some restaurants we use the same frying oil to prepare menu items that may or may not contain meat. All meatless ingredients are handled by our employees in common with meat ingredients, which may not be acceptable to certain types of vegetarian diets. Product formulations and/or ingredient changes may occur before www.tacobell.com is updated. Variations may occur due to differences in suppliers, ingredient substitutions, recipe revisions and/or product production at the restaurant. Limited time offers, test products, or regional items have not been included.