Preheat Like You Mean It: Preheat the oven to 350°F and line a 9×5 loaf pan with parchment so the loaf lifts out clean and cute.
Make the Flax “Egg”: Stir the ground flaxseed and warm water together, then let it sit 8 to 10 minutes until thick and gel-like.
Mash Those Bananas: Mash bananas in a large bowl until mostly smooth with a few small lumps, because those little banana pockets are pure joy.
Mix the Moisture Squad: Stir in the flax gel, applesauce, agave, coconut oil (or tahini), and vanilla until glossy and well combined.
Whisk the Dry Team: In a second bowl whisk whole wheat flour, Oatsome oat flour, baking soda, cinnamon, nutmeg, and salt until evenly mixed.
Combine Gently: Pour the dry ingredients into the wet and fold just until you no longer see dry flour, then stop because overmixing is how bread gets moody.
Add the Lift: Stir in the lemon juice (or vinegar) to wake up the baking soda, then fold in nuts if using.
Rest, But Not Too Long: Let the batter sit 2 minutes so the flour hydrates without turning the crumb gummy.
Bake It Up: Pour batter into the pan, add a sliced banana on top if you want, and bake 48 to 60 minutes, checking around 48 to 50.
Check for Doneness: Pull it when a toothpick comes out with moist crumbs (not wet batter) and the center looks set, not jiggly; optional thermometer target is 200 to 205°F in the center.
Cool for the Perfect Slice: Cool 15 minutes in the pan, lift out, then cool at least 60 minutes before slicing so it sets up tender, not sticky.