I make my own doggie treats these days. They love baby carrots. I dry apples and sweet potatoes for them as well as turkey.
My sister lost her beloved “Keystone” a few years ago, fed only expensive, upscale dog food. Kidneys went and he was a young, healthy dog. Vet said it was almost certainly tainted dog food from China and he’d seen it before. She cried her eyes out.
I fed my shih-tzu the jerky dog treats that ended up being on the “tainted” list but I, and my dog were lucky.
I too make my own dog food now — haven’t made the treats you describe, neither of my dogs will eat anything with sweet potato, apples or blueberries, unfortunately, only meet and greens. They are surely spoiled dogs but they protect our home and us and have brought us years of love and joy.