METHOD
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whole wheat streusel
First, make the whole wheat streusel. Cut the cold butter into small cubes. In a small bowl, stir to combine butter, sugar, and whole wheat flour. Using your fingertips lightly rub the butter into the mixture, to get a sand-like texture. Keep refrigerated until needed. Preheat the oven to 180 °C / 355 °F.
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sour cream coffee cake batter
Make the coffee cake. In a small bowl, stir to combine the all-purpose flour and baking powder. In a large bowl, beat the room temperature butter, sugar, vanilla, and salt. Using an electric mixer, mix for about 5 - 8 minutes, or until the mixture is white, fluffy, and creamy.
TipThis step is very important. If we don’t mix the batter long enough, the cake won’t be as fluffy and soft when baked. -
sour cream coffee cake batter
While mixing with an electric mixer (or using a stand mixer) add the eggs one at a time and beat well. Then, add flour mixture in four additions, alternating with sour cream mixture while mixing at medium speed after each addition. The batter should be soft and creamy.
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sour cream coffee cake with streusel
Grease a 25 cm x 35 cm (9 x 13-inch) baking sheet with butter, then line with parchment paper. Spoon 2/3 of the coffee cake batter into the prepared baking sheet and smooth using a spatula. Spread the raspberry jam over the batter and spoon the rest of the coffee cake batter on top. Sprinkle with the chilled whole wheat streusel.
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bake and serve
Transfer the coffee cake to the oven on the middle rack. Bake for 40 - 45 minutes at 180 °C / 355 °F or until the cake is baked and the streusel is beautifully golden-brown. Take the baked coffee cake from the oven and let it cool to room temperature, then cut in 16 slices and serve.