Preheat the oven to 400 degrees F. and line a baking sheet with parchment paper.
Combine your flour, sugar, salt and baking powder together in a medium bowl.
Cut in the butter using your hands or pastry cutter until the flour resembles large crumbs.
Mix the lemon zest, juice, heavy cream and eggs in a small bowl and whisk together.
Dig a well in the middle of the flour mixture and pour in the egg mixture. Use a fork to combine. Once a dough forms, use your hands to full incorporate the egg mixture into the dough. Fold in the blueberries.
Place the dough on the parchment paper and form into a square that is about 1" thick. Cut into 8 pieces and separate each slice so they are not quite touching.
Make the streusel topping by combining all the ingredients together and using a fork to mix well until large crumbs form. Cover the scones with the streusel topping and bake for about 20 minutes or until a light golden brown.
Transfer the finished scones to a wire rack to cool and enjoy.
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