Ingredients

• Cooking spray

• 1 1/2 cups granulated sugar

• 1 1/4 cups all-purpose flour (about 5 1/3 ounces)

• 1/2 cup corn flour (such as Bob’s Red Mill) (about 2 ounces)

• 1 tablespoon finely ground coffee (preferably Turkish coffee)

• 1 teaspoon kosher salt

• 1 teaspoon baking powder

• 1/2 teaspoon baking soda

• 1 cup cold unsalted butter (8 ounces), cut into small cubes

• 3 large eggs

• 1 cup sour cream

• Unsweetened whipped cream, for serving

• 1/2 cup plus 1 tablespoon all-purpose flour (about 2 1/2 ounces) 

• 1/4 cup granulated sugar

• 1 tablespoon nigella seeds

• 1/8 teaspoon pumpkin pie spice

• 1/8 teaspoon kosher salt

• 1/4 cup unsalted butter, melted