Sorry, that's a new one for me...perhaps over-mixing.
Last year I developed a lemon blueberry muffin for an event. I'm told it's good. I can't eat gluten so I've not tasted it. Your welcomed to have it. Recipe & photo below.
Blueberry Lemon Muffin
By Norcalbaker59
Preheat oven 375
Line 2 - 12 cup muffin tins (yield depends on muffin tin size)
Bake time approximately 20 minutes
All ingredients should be 70 degrees
I use Central Milling Artisan Craft (Hard Red Winter Wheat, 11.5% protein). A comparable flour is King Arthur All Purpose.
Whisk throughly dry ingredients and set aside
250 g all purpose flour
12 g of baking powder
5 g of baking soda
2 g salt
In separate bowl, whisk to blend, set aside
83 g eggs, 70 degrees
200 g buttermilk, 70 degrees
12 g vanilla extract
In mixer bowl, rub zest into sugar with fingers to release oils
165 g of sugar
Zest of large lemon
Cream butter and lemon sugar with paddle attachment on medium until light and fluffy (kitchenaid setting 4)
95 g unsalted butter, 70 degrees
To creamed butter, alternately add wet and dry ingredients in two additions
Mix until just combined
Mix in by hand
250 g fresh blueberries, washed and dried
Fill muffin cups 2/3 full
Optional: sprinkle tops with raw sugar before baking