Heat oven to 400.
muffin pan or line with paper cups.
Mix topping ingredients together, cutting in the butter with a pastry
cutter or a fork until its crumbly. Set aside.
Toss blueberries with 1 tablespoon of flour to coat.
Mix dry ingredients in a large bowl. Combine the creme fraiche, milk, oil, egg
and extract together. Pour the wet mixture into the dry, stir, add the lemon juice
and continue to mix until the dough
comes together. Fold in the blueberries
Spoon the batter
into the prepared muffin tin
, sprinkle with topping and bake in preheated oven for 20-25 minutes or until a tooth pick comes out clean.