Loaf 1: banana bread

Banana bread is Loaf 1 of 16, and it is the baseline. Nothing has changed yet, because there is nothing yet to change from.

It is here because you already know how to make it. The course moves exactly one ingredient or one technique per loaf, sixteen loaves from this batter to a rye sourdough, and a course like that has to start on ground you are already standing on.

The four things that never move

Four things are frozen for all sixteen loaves: 400 g flour, 8 g salt (2%), one 9 x 5 inch (23 x 13 cm) loaf pan, and an oven at 375°F / 190°C.

Freezing them is what makes the loaves comparable. Every baker's percentage you will read in this course is a percentage of that same 400 g of flour, so a number at Loaf 1 means the same thing as a number at Loaf 16. Salt is the one seasoning decision in bread, 2% is the answer, and settling it once takes it off the list. The pan holds the dough up while you learn everything else, and one oven setting means the oven is never the thing that changed.

You never need a Dutch oven to finish this course.

The formula

Hydration: 60% (240 g water on 400 g flour)

Grams first, cups in parentheses, because you may not own a scale yet. A $12 scale with a tare button is the one purchase that makes any of this repeatable. Flour measured by the cup varies by up to 25% between two people, which is exactly why the same recipe works for one of them and fails for the other.

Method

1. Heat the oven to 375°F / 190°C. Grease the pan.
2. Mash the banana in a large bowl. Whisk in the eggs, sugar and oil until smooth.
3. Whisk the flour, salt and baking powder together in a second bowl.
4. Tip the dry into the wet and stir just until the last streak of dry flour disappears. The batter should still look slightly lumpy.
5. Scrape into the pan, level the top, bake at 375°F / 190°C for 55 to 65 minutes.
6. Cool in the pan 15 minutes, then on a rack until the middle is room temperature, about 1 hour.

Why this works

Baking powder is a chemical leavener. It releases carbon dioxide, the gas that makes the bubbles, when it gets wet, and again when it gets hot. Nothing alive is involved and nothing has to be fed or waited on, which is why this loaf goes from bowl to oven in one session.

The banana, the egg and the oil are carrying all the liquid, all the sweetness and all the tenderness. That is why the batter tolerates almost anything you do to it, and why a first-time baker can hit it.

Now the part that sets up the rest of the course. This batter pours off a spoon, so it feels like a wet thing. It is not. The 220 g of banana carries 165 g of water, because ripe banana is 75% water, and the two eggs carry 75 g more, because whole egg is 75% water. That is 240 g of water on 400 g of flour, which is 60% hydration: an ordinary, slightly stiff bread dough.

So what makes it pourable is not the water. It is the 41% sugar and the 20% fat.

Sugar dissolves into the water and competes with the flour for it, so less of that water ever reaches the flour. Fat coats the flour proteins and blocks them from linking up into the stretchy, continuous network that traps gas, the one bakers call gluten. Between them, sugar and fat keep this mixture a batter at a hydration that would otherwise give you dough.

Hold onto that. It means the road from here to sourdough is not a road that takes water out.

How you know it's ready

A skewer pushed into the center comes out with moist crumbs clinging to it and no wet batter, and the center reads 200 to 205°F / 93 to 96°C.

Color is not the gate. The top browns well before the middle sets, which is the single most common reason a banana bread comes out of the oven raw in the middle: it looked done. 55 to 65 minutes at 375°F / 190°C is what it usually takes, and that number is context for the look, never a replacement for it.

What goes wrong

The failure this loaf introduces: a tough loaf with vertical tunnels running up through the crumb.

One cause: stirring after the flour was wet. Water plus movement builds gluten, and a batter wants none. The tunnels are gas forcing its way up through a network that is stronger than it should be.

The fix is to stop at the last streak of flour and accept a lumpy batter. Lumpy is correct here. Smooth is the warning sign.

When it worked

Domed, with a split running down the top where the crust set before the rise finished. Deep golden brown. The crumb is soft, close, faintly moist and sweet. It slices warm without dragging.

Bake it twice, and pass the gate both times, before you move on to Loaf 2. One good loaf is luck. Two in a row is a skill.