Start by greasing a silicone mold or mini muffin pan that fits inside your Instant Pot. Set aside.

1. In a large bowl, mash the ripe bananas with a fork until smooth.
2. Add the melted butter, milk, vanilla extract, and egg to the mashed bananas, and whisk until well combined.
3. In a separate bowl, mix the all-purpose flour, sugar, brown sugar, baking soda, baking powder, salt, and cinnamon.
4. Gradually fold the dry ingredients into the wet ingredients until just combined. Be careful not to overmix.
5. If using, fold in the chocolate chips or chopped walnuts.
6. Spoon the batter into the silicone mold or mini muffin pan, filling each compartment about halfway.
7. Add 1 cup of water to the bottom of the Instant Pot insert. Place a trivet in the Instant Pot and carefully place the filled mold or pan on top.
8. Seal the Instant Pot lid, set the valve to “sealing,” and cook on high pressure for 12 minutes.
9. Once the cooking time is up, allow the pressure to naturally release for 5 minutes, then carefully quick-release the remaining pressure.
10. Remove the mold or pan from the Instant Pot and let the banana bread bites cool for a few minutes before serving.