This recipe features a moist, buttery base with a thick, crunchy streusel topping. For the Cake: Flour: 1 ½ cups all-purpose flour [13, 19, 43] Sugar: ½ cup granulated sugar [13, 19, 43] Leavening: ½ tsp baking soda and ½ tsp salt [13, 43]

In a medium bowl, whisk together the flour, sugar, baking soda, and salt [13, 43].

Mix the brown sugar, flour, and cinnamon. Cut in the cold butter with a fork until the mixture is clumpy and crumbly. Sprinkle it generously over the batter [13, 43].

Coffee cake pairs exceptionally well with bright South American coffee brews or a dollop of Greek yogurt on the side [14, 23, 26].

In a separate bowl, whisk the egg, sour cream, milk, melted butter, and vanilla until smooth [13, 43].