Preheat oven to 350 degrees F.
Grease or line 24 muffin tins with paper liners.
In a large bowl, whisk together the flour, baking powder, baking soda, sugar, and salt. In another bowl, combine the Greek yogurt and eggs. Whisk to break up the eggs, then add the lemon juice, lemon zest, and melted butter and whisk again.
Add the flour mixture into the yogurt mixture and fold with a rubber spatula until almost completely mixed.
In a small bowl, combine the blueberries with one tablespoon of flour, toss until coated and carefully fold in the blueberries to the rest of the batter.
Scoop the lemon blueberry batter into the prepared muffin tins, about 3/4 full, then sprinkle the tops with Sugar in the Raw (about 1 teaspoon per muffin).
To make the streusel topping, combine the flour, sugar and melted butter. Mix until combined, then add about 2 tablespoons of streusel to the top of each muffin.
Bake in your preheated oven for 22-25 minutes, or until lightly golden brown and a toothpick inserted into the center comes out clean. Cool on a wire rack for at least 5 minutes before serving. Enjoy!