Buttery Apple Cake

INGREDIENTS

• Vegetable-oil cooking spray
• 3/4 cup all-purpose flour, plus more for dusting
• 1 pound Granny Smith apples, peeled and shredded on the large holes of a box grater (about 2 cups)
• 1/2 cup sugar
• 1 1/2 teaspoons baking powder
• 1/4 teaspoon salt
• 6 tablespoons whole milk
• 1/4 cup vegetable oil
• 2 large eggs
• 6 tablespoons unsalted butter, softened
• 1/3 cup sugar
• 1 large egg, lightly beaten
• 1 teaspoon pure vanilla extract
• Heavy cream, for serving