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Preheat the oven to 350°F. Line the wells of a standard muffin pan with papers and grease the papers.
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To make the batter: In a large bowl, stir together the batter ingredients until thoroughly combined. Set aside.
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To make the filling: In a medium bowl, stir together the filling ingredients until smooth. Set aside.
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To make the topping: In a medium bowl, whisk together the Measure for Measure, sugar, cinnamon, and salt. Add the melted butter, stirring until crumbs form. Mix in the nuts or ginger.
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To assemble and bake the muffins: Drop a scant 2 tablespoons of the batter (a heaping tablespoon cookie scoop works well here) into each muffin cup, spreading it to cover the bottom.
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Dollop on a heaping tablespoon of filling, then cover with another 2 tablespoons of batter.
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Sprinkle a tablespoon of streusel on top.
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Bake the muffins for 20 to 23 minutes, until they appear set on top and a toothpick inserted around the edge (you don’t want it to hit the filling) comes out clean.
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Remove the muffins from the oven and when they’re cool enough to handle, transfer them to a rack to cool completely.
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Storage instructions: Store muffins, well wrapped, in the refrigerator for up to five days; freeze for longer storage.