Best Reduced-Carb Blueberry Muffin EVER!

The wild Maine blueberries are in and I can't get enough of them. I wanted to make fresh blueberry muffins, but my past attempts have been less than satisfactory because either they didn't have enough blueberry flavor or, if I tried to add more, the blueberries would sink to the bottom in a soggy layer that would fall apart. I saw a recipe demonstrated on America's Test Kitchen television show on PBS that suggested swirling blueberry jam into the batter, which made sense. So, starting with their

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