For the streusel;

¼ Cups Granulated sugar

⅓ Cups Light brown sugar

1 Teaspoon Ground cinnamon

¼ Teaspoons Ground nutmeg

½ Cups Unsalted butter, melted

1 ⅓ Cups All-purpose flour

For the cake;

6 Tablespoons Unsalted butter

¾ Cups Granulated sugar

3 Eggs

1 Teaspoon Vanilla extract

½ Teaspoons Grated lemon zest

1 Teaspoon Lemon juice

⅔ Cups Sour cream

1 ¼ Cups All-purpose flour

1 Teaspoon Baking powder

¼ Teaspoons Baking soda

½ Teaspoons Fine salt

1 Cup Fresh blueberries