Nanci's Blueberry Crumb Cake

This blueberry cake is the kind of unfussy baking that grandmothers excel at. A simple batter of flour, sugar, egg, oil, and milk, loaded with two full cups of fresh blueberries, topped with a cinnamon-butter crumb streusel, and baked in a loaf pan for a full hour. No mixer needed, no complicated steps.

The loaf pan format is what makes this cake special. Instead of a flat sheet cake, you get a tall, dense slice with blueberries distributed all the way through and a thick layer of crumbs on top. Every piece looks like something from a bakery counter.

Oil instead of melted butter in the batter keeps the crumb moist and tender for days. Butter-based cakes tend to dry out faster, but oil holds moisture, which matters when you’re baking a loaf that needs a full hour in the oven without turning tough.

The crumb topping is a quick mix of sugar, flour, butter, and cinnamon rubbed together until it forms coarse, sandy clumps. Press it gently onto the batter so it adheres, and it’ll bake into a crunchy, golden crust that shatters when you bite through it.

Pro Tips

• Toss the blueberries in a tablespoon of flour before folding them in. The flour coating prevents them from sinking to the bottom of the loaf.
• Fold the berries in gently. Rough stirring breaks them and turns the batter purple.
• Check for doneness with a toothpick at the 55-minute mark. Loaf pans trap heat differently than flat pans, and the center can stay underdone if you go strictly by time.
• Let the cake cool in the pan for at least 15 minutes before removing. The crumb topping is fragile while warm.

Variations

• Lemon blueberry: Add a tablespoon of lemon zest to the batter for a bright citrus contrast to the sweet berries.
• Mixed berry: Use a combination of blueberries, raspberries, and blackberries for a more complex fruit flavor.
• Almond crumb: Add chopped almonds to the streusel for a nutty crunch on top.