Pop-Tarts Frosted Boston Creme Donut Breakfast Toaster Pastries are a modern American treat. Each serving of 2 pastries contains 370 calories. They are caffeine-free, GMO-free, and suitable for vegetarians. The 16-count box offers 8 servings. These toaster tarts are a delicious snack or appetizer option from the Kettle Sensations product line.