Salted Bourbon Apple Crumble Coffee Cake

Ingredients

• 2 teaspoons vanilla extract
• 2 cups all-purpose flour
• 2/3 cup plain Greek yogurt or sour cream
• 1 tablespoon bourbon
• 2 large eggs, at room temperature
• 4 tablespoons salted butter
• 1/2 teaspoon sea salt
• 3/4 cup all-purpose flour
• 1 teaspoon cinnamon
• 1 stick salted butter, at room temperature
• 2 teaspoons cinnamon
• 3/4 cup powdered sugar
• 1/4 cup apple cider
• 1 1/2 cups chopped apples, plus 1 small apple, thinly sliced
• 1/2 teaspoon baking soda
• 6 tablespoons cold butter, grated
• 1/4 cup bourbon
• 3/4 cup packed brown sugar
• 1/2 cup packed brown sugar
• 1/3 cup apple butter
• 1/4 teaspoon kosher salt
• 2 teaspoons baking powder
• 2 tablespoons maple syrup