Batter will be super thick, may need to work blueberries in by hand and press into cake pan.
2 C flour
1/2 C sugar
2 tsp baking powder
1 large egg, slightly beaten
1/2 C milk
1/4 C butter, softened but not melted
1 tsp vanilla
2 cups frozen blueberries
Topping:
1/3 C sugar
1/4 C flour
1/4 C finely chopped pecans
1/2 tsp cinnamon
3 Tbsp cold butter
Combine together in separate bowl, working butter in until fine crumbs. Set aside to top cake before it goes in the oven.
Preheat 350.
Mix dry ingredients. Add butter, egg, milk, vanilla until just moist. Fold in blueberries. May need to use hands. Batter will be very thick.
Top with pecan mix.
Bake 40 to 45 minutes.
Would be excellent served with a dollop of whipped cream