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Preheat the oven to 375°F. Grease a 12-cup muffin pan, or line the pan with papers. Spray the papers with non-stick pan spray, to aid release. Note: The streusel topping on these muffins can burn if your oven temperature is too high. If your oven tends to "run hot," bake the muffins at 350°F instead of 375°F.
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To make the batter: Place the sugar, soft butter, salt, baking powder, nutmeg and vanilla in a mixing bowl, and beat with an electric mixer until fluffy.
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Beat in the eggs one at a time, scraping the bottom and sides of the bowl between additions.
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Whisk together the flour and xanthan gum. Add to the mixture in the bowl, alternately with the milk.
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Stir in the blueberries, chopped apple, or fruit of your choice.
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Scoop the batter into the prepared pan, mounding the cups full. A heaped muffin scoop works well here. Note: the batter will be VERY sticky; that's what it's supposed to be.
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To make the topping: Combine all of the ingredients to form small crumbs. Sprinkle about 1 tablespoon topping onto each muffin, pressing it in gently.
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Let the muffins rest for 10 minutes. Then bake them for 20 to 25 minutes, till lightly browned. Remove from the oven, and let sit for 5 minutes before removing from the pan. Best served warm.