Rhubarb Sour Cream Coffee Cake (Print Version)

Moist cake with tart rhubarb, creamy sour cream, and spiced nutty streusel topping.

# Ingredients:

→ Streusel Topping

01 - 200 g brown sugar, packed
02 - 65 g all-purpose flour
03 - 1 tablespoon ground cinnamon
04 - 0.5 teaspoon freshly grated nutmeg
05 - 115 g cold unsalted butter, cubed
06 - 100 g chopped walnuts or pecans, optional

→ Cake Base

07 - 315 g all-purpose flour
08 - 1 teaspoon baking powder
09 - 1 teaspoon baking soda
10 - 0.5 teaspoon salt
11 - 225 g unsalted butter, softened
12 - 300 g granulated sugar
13 - 2 large eggs, room temperature
14 - 2 teaspoons pure vanilla extract
15 - 240 g full-fat sour cream
16 - 350 g fresh rhubarb, diced to 1.25 cm pieces

# Instructions:

01 - Preheat oven to 175°C. Grease a 23×33 cm baking dish or line with non-stick spray, ensuring all corners are coated.
02 - In a medium bowl, blend brown sugar, flour, cinnamon, and nutmeg. Cut in cold butter using a pastry blender or fingers until the mixture forms coarse crumbs. Stir in nuts if desired and set aside.
03 - In a separate bowl, whisk together flour, baking powder, baking soda, and salt.
04 - With a stand mixer or hand mixer, beat softened butter and granulated sugar until pale and fluffy, approximately 3 minutes.
05 - Add eggs one at a time to the creamed mixture, beating thoroughly after each. Mix in vanilla extract.
06 - Add the dry ingredients and sour cream alternately to the butter mixture, beginning and ending with the dry ingredients. Mix softly after each addition until just combined.
07 - With a spatula, gently fold diced rhubarb into the batter, taking care not to overmix.
08 - Spread half of the batter evenly into the prepared pan. Sprinkle with half of the streusel topping.
09 - Dollop the remaining batter over the streusel and gently spread to cover. Top with the remaining streusel mixture.
10 - Bake in the centre of the preheated oven for 45–50 minutes until a toothpick inserted in the centre emerges clean with slight moist crumbs. The top should be golden and crisp. Allow the cake to cool in the pan on a wire rack for at least 20 minutes before serving.

# Notes:

01 - Ensure the butter is well softened for a light, aerated crumb. Overmixing once the flour is added can result in a dense texture.