Q: Can I make it in a different tin?

Absolutely! A 20 cm (8-inch) square tin is your best bet as it's practically the same volume as a 23 cm (9-inch) round tin, so the thickness and bake time should be roughly the same. Make sure to leave some overhanging parchment paper so you can easily lift the cake out. For a smaller cake: you can halve the recipe and bake it in a 15 cm (6-inch) round tin . Bake time will be around 30-35 minutes.

Question 1

Can I use frozen blueberries?

Accepted Answer

Yes, you can...however with frozen berries there's always a risk of excess moisture. To prevent them from turning your cake purple and/or gummy, use them straight from the freezer — do not rinse or defrost them first (frozen berries are pre-washed anyways).

Question 2

Can I make it in a different tin?

Accepted Answer

Absolutely! A 20 cm (8-inch) square tin is your best bet as it's practically the same volume as a 23 cm (9-inch) round tin, so the thickness and bake time should be roughly the same. Make sure to leave some overhanging parchment paper so you can easily lift the cake out.

For a smaller cake: you can halve the recipe and bake it in a 15 cm (6-inch) round tin. Bake time will be around 30-35 minutes.

Question 3

Why did my cake batter curdle?

Accepted Answer

Yogurt and sour cream are acidic ingredients so they can make the batter split and look curdled. Don't worry — once you add the flour, the batter will re-emulsify and smooth out.

Question 4

Why coat the blueberries in flour?

Accepted Answer

Coating berries in a light layer of flour prevents them from sinking to the bottom of the cake batter — the theory is that the starch gives them extra grip. It also absorbs the excess moisture as they cook so you don't end up with wet pockets surrounding the fruit.

Question 5

How do I store blueberry coffee cake?

Accepted Answer

Once completely cooled, transfer the cake to an airtight container and store at room temperature for 1-2 days, or in the fridge for up to 3-4 days. The streusel topping will soften over time due to trapped moisture. Lining the container with paper towel can help keep it crisp. If refrigerated, bring the cake back to room temperature or warm it slightly before serving.

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