Preheat oven to 350 degrees F
Start by making the crumb top. Melt butter and add the rest of the crumb topping ingredients to it. Mix well and set aside.
Mix together dry ingredients (1 1/2 cup flour, baking powder and salt) into a small mixing bowl.
In a large mixing bowl, add and mix together all the wet ingredients - sugar, eggs, Greek yogurt, vegetable oil, and lemon juice.
Add dry ingredients into wet ingredients, stir to mix well.
Add 1 tsp flour to blueberries and toss blueberries. Then gently fold blueberries into the bread mixture.
Line a 9"x5" bread pan with parchment paper. If not using parchment paper, grease bread pan. Pour bread mixture into a bread pan.
Evenly spread crumb topping on the top of the bread mixture. Gently press on crumb topping so that it sticks to bread after baking.
Bake for about 60 minutes.
Remove and cool for 10 minutes. Remove bread from bread pan, and cool for another 10 minutes. Slice and serve!