1 — Prep the crockpot & pan
Grease and flour the inside of a 3-qt loaf pan or small oven-safe dish. Place that pan inside your 6-qt crockpot. If the pan wobbles, tuck a rolled-up kitchen towel in the bottom for stability.
2 — Make the flax eggs
Mix 2 tbsp ground flaxseed with 6 tbsp water. Let it sit for 5 minutes until thick. This replaces real eggs and adds a nice binding texture.
3 — Cream fat and sugar
In a bowl, cream 1/3 cup vegan margarine and 3/4 cup light brown sugar with a mixer until fluffy — about 2–3 minutes. Scrape down the sides.
4 — Add the wet stuff
Slowly add the flax eggs, 1 tsp vanilla, and mashed bananas. Beat until smooth and well combined.
5 — Combine the dry mix
Sift (or whisk) together 1 3/4 cups flour, 2 tsp baking powder, 1/4 tsp baking soda, and 1/2 tsp salt in a separate bowl.
6 — Fold and finish
Slowly beat the dry mix into the wet mixture until combined. Fold in 1/2 cup chopped nuts or berries. Don’t overmix — just combine.
7 — Bake in the crockpot
Pour batter into the greased loaf pan. Cover the crockpot and cook on HIGH for 2–3 hours (the recipe notes say 2–3; I recommend ~3 hours for a reliably set center). Start checking at 2 hours. Insert a toothpick into the center; it should come out mostly clean with a few moist crumbs. If it needs more time, check every 15–20 minutes.
8 — Cool and serve
Turn off the crockpot and let the loaf cool in the pan for 15–20 minutes, then carefully invert onto a serving plate. Slice and serve warm or at room temperature.
Pro tip: For extra crisp edges, pop slices under a broiler for 1–2 minutes. Totally optional, totally delicious.