Vanilla Cake:

• 3 cups all-purpose flour
• 2 teaspoons baking powder
• 1/4 teaspoon baking soda
• 1/2 teaspoon salt
• 1/2 cup unsalted butter (room temperature)
• 1 ¼ cups granulated sugar
• 1/2 cup vegetable oil
• 2 large eggs (room temperature)
• 2 teaspoons vanilla extract
• 1 cup whole milk (room temperature)

Crumb Topping:

• 1/2 cup all-purpose flour
• 1/2 cup powdered sugar
• 4 tablespoons unsalted butter (cold)
• 1/2 teaspoon lemon zest
• 1/4 teaspoon vanilla extract

Lemon Mascarpone Cream Filling:

• 1 cup heavy whipping cream
• 1 cup mascarpone cheese (room temperature)
• 2 cups powdered sugar
• 1/2 teaspoon lemon zest
• 2 tablespoons lemon juice