Starbucks publishes a full ingredient statement for every food item on its own site, and the picture is mixed: the bakery and breakfast sandwiches lean on canola and soybean oil - the artisan roll is canola, the frittata patty soybean - while the plainer items are shorter and cleaner. Read the starbucks research row for the per-item detail behind this.
Starbucks publishes a full ingredient statement on every product page, so this one was easy to verify. The food case is where the seed oils live: the artisan roll has canola oil, the egg frittata patty soybean oil, the banana walnut and pecan loaf soybean and/or canola oil, and the birthday cake pop soybean plus palm oil. Plain brewed coffee, espresso and tea have none, which is why this is "some" rather than most. Additives split the same way — every food item I read carried emulsifiers, colors or preservatives (mono- and diglycerides, polysorbate 60, sorbitan monostearate, annatto and turmeric color, shellac, and sodium nitrite in the bacon), while a black coffee has nothing in it at all. Worth knowing: most Starbucks stores have high-speed ovens rather than real kitchens, so the food arrives already made and is warmed to order. I did not rate plastic contact.