I still have several pounds of blackberries in my freezer from last summer's berry picking. Generally, can they be substituted for blueberries when baking? I'd like to successfully try them in this recipe and in other blueberry recipes on your website. They are the same size as blueberries but not as sweet. Yes, absolutely - the muffins should be more than sweet enough to make up for any extra tanginess in the berries, Kathleen... PJH

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