Prep the sweet potato: Preheat oven to 375°F (190°C). Peel and cube the sweet potato.
Steam or microwave until very soft, about 8–10 minutes steaming or 5–7 minutes microwaving. Mash until smooth.
Grate the apple: Peel if you prefer a smoother texture. Grate on the fine side and squeeze out excess liquid with a clean towel or paper towel so the batter isn’t too wet.
Mix the wet ingredients: In a medium bowl, combine mashed sweet potato (about 1 cup), grated apple (about 3/4 cup after squeezing), egg, applesauce, vanilla, and oil or melted butter if using.
Stir until smooth.
Add dry ingredients: Stir in oats, cinnamon, baking powder, and a pinch of salt if using. The mixture should be thick and scoopable, not runny. If it’s too wet, add 1–2 tablespoons more oats.
Rest the batter: Let the mixture sit for 5 minutes so the oats hydrate.
This helps the bites hold their shape.
Shape the bites: Line a baking sheet with parchment or lightly spray it. Scoop tablespoon-sized mounds and gently flatten each to about 1/2 inch thick. Aim for 20–24 small bites.
Bake: Bake for 12–16 minutes, until set, lightly golden at the edges, and springy to the touch.
They should be soft, not crispy.
Cool completely: Let the bites cool on the sheet for 5 minutes, then transfer to a rack. Cooling helps them firm up for tiny hands.
Serve: Offer plain, or with a thin smear of plain yogurt or unsweetened nut butter for older toddlers.