
Step 1 · Prepare oven and pan
Heat the oven to 350°F / 175°C, conventional setting. Lightly grease the loaf pan and line it with a strip of parchment.
Step 2 · Mash bananas
Mash the bananas in a large bowl with a fork. A few small lumps are fine.
Step 3 · Mix wet ingredients
Add the eggs, sugar, oil and vanilla. Whisk with a fork or whisk until combined.
Step 4 · Add dry ingredients
In another bowl, stir together the flour, baking powder, baking soda, salt and cinnamon. Add to the banana mixture and gently fold until no dry flour remains. Stop there to avoid overmixing.
Step 5 · Bake
Scrape into the pan and smooth the top. Start checking at 50 minutes; it may take up to 65 minutes. A skewer inserted into the centre should come out with a few moist crumbs but no wet batter. If the top is getting dark before the middle is ready, loosely cover it with foil.
Step 6 · Cool
Leave in the pan for 10–15 minutes, then lift onto a rack. Let it cool for at least another 30 minutes before slicing.