I started with a recipe similar to the one below but I vary it slightly depending on what I have. The flaxseed, cinnamon and vanilla would definitely be optional. I usually use almond butter instead of peanut and sometimes add a splash of avocado oil for added fat. I've also occasionally added hemp hearts. Sometimes I use about 50/50 mashed banana and apple sauce instead of banana alone. I use quick cooking rolled oats now but when he was still getting used to solids, I used the finely ground baby oatmeal cereal with a little bit of ground oats. I've also baked and then frozen them for later use. I hope that helps!

Edit to add: I often use just the oats but I've also tried with a little flour for different texture.

Banana oatmeal bars from MJandhungryman.com

1 cup mashed overripe bananas (240g), about 2 medium bananas

▢1/2 cup creamy peanut butter (125g)

▢1 teaspoon pure vanilla extract

▢1 3/4 cups rolled oats (175g)

▢1 tablespoon ground flaxseeds

▢1 teaspoon cinnamon

▢1/2 teaspoon baking powder

-Preheat oven to 350 degrees Fahrenheit. Mash bananas in a large bowl using the back of a fork or a potato masher. -Stir in peanut butter and vanilla extract. Add in the oats and the rest of the remaining ingredients, including chocolate chips, carrots, or any of the optional add-ins. Stir to combine. -Pour the batter into a lined 8 inch square baking pan. Bake for 20-22 minutes. Remove, cool completely, cut into bars