Prep the pan: Heat your oven to 350°F (175°C). Line a baking sheet with parchment paper or lightly grease it.
Mash the bananas: In a mixing bowl, mash the bananas with a fork until mostly smooth with a few small lumps.
Add the mix-ins: Stir in the nut or seed butter, chia or flax, cinnamon, vanilla, and a pinch of salt if using.
Mix well.
Stir in the oats: Add the oats and combine. The mixture should be thick and scoopable. If it seems dry, add milk 1 tablespoon at a time until it holds together but isn’t runny.
Portion the bites: Scoop tablespoon-sized mounds onto the baking sheet.
Gently flatten each mound with damp fingers to about 1/2 inch thick for even baking.
Bake: Bake for 10–14 minutes, until set and lightly golden on the bottom. They should feel soft and springy, not crisp.
Cool completely: Let the bites cool on the pan for 5 minutes, then transfer to a rack to cool fully. Cooling helps them firm up and hold their shape.
Serve: Offer as-is, or cut in half for younger toddlers.
Pair with yogurt, cottage cheese, or a little fruit for a more filling snack.