Ingredients

Streusel Crumb Topping:

• 2/3 cup all-purpose flour
• 2 Tablespoons light brown sugar
• 1/4 cup granulated sugar
• dash of salt
• 1/4 cup unsalted butter-melted

Lemon Cake Mixture:

• 1 1/2 cups all-purpose flour
• 1/4 teaspoon salt
• 2 teaspoons baking powder
• 1/2 cup unsalted butter-softened
• 3/4 cup granulated sugar
• 1 egg
• 1 egg yolk
• 2 Tablespoons lemon zest
• 1 teaspoon vanilla
• 2 Tablespoons freshly squeezed lemon juice
• 1 teaspoon lemon extract
• 1/2 cup sour cream

Cream Cheese Filling:

• 6 oz. cream cheese-room temperature
• 3 Tablespoons granulated sugar
• 2 Tablespoons flour
• 1 egg white
• 1 teaspoon vanilla or lemon extract

Glaze:

• 3/4 cup powdered sugar
• 1 1/2 –2 1/2 teaspoons lemon juice