I would make it with fresh blueberries, sure, but I prefer the frozen variety, they seem to be larger in size and more economical than those tiny baskets of fresh blueberries from the supermarket. The lemon zest gives them an intoxicating aroma, and although the juice of fresh lemon is subtle, it enhances both flavor and texture. If you don’t have a fresh lemon, it is best to leave it out; lemon extract and concentrated lemon juice gives a bitter flavor. Speaking of substitutions, full fat sour cream and real buttermilk is a must. Buttermilk made from milk and vinegar will never be as good as the real thing.
- Preheat oven to 425F.
- Line a muffin tin with large size parchment liners.
- Add soft butter, oil, sugar, eggs, zest of 1 lemon, baking powder, baking soda and salt to a beater bowl and beat until fluffy.
- Add the lemon juice and beat to combine.
- In a medium bowl put the blueberries with a scant 1/4 cup of the flour. Tipping the bowl, coat the blueberries with the flour.
- In a measuring cup whisk together the sour cream and the buttermilk.
- Alternating, gradually add the remaining flour and the sour cream mixture to the butter mixture and stir it with a wooden spoon to combine. [From here on end don’t beat the batter]
- Add the blueberries and gently fold it into the batter.
- Divide the batter in the prepared muffin tin.
- Bake in the preheated oven for 8 minutes.
- Reduce heat to 400F and bake 12 minutes longer.
- Test for doneness and bake it 2-3 minutes longer if needed. It took 15 minutes longer in my oven.
- Remove muffin tin from the oven and place on a wire rack.