
My Apple Coffee Cake is the ultimate bakery-style fall treat—easy, beginner-friendly, and topped with streusel for breakfast, snack, or dessert.
Preheat the oven to 350°F (180°C). Butter and line an 8-inch (20-cm) square cake pan. Set aside.
In the bowl of a food processor, add the walnuts, oats, brown sugar, cinnamon, and cardamom and pulse until the mixture is evenly crumbly.
Transfer to a medium bowl, then stir in the melted butter using a spatula until well combined. Set aside.
In the bowl of a stand mixer fitted with a paddle attachment (or with a handheld electric mixer), beat the eggs and granulated sugar together on medium speed until light and fluffy, about 5 minutes.
In a separate bowl, combine the flour, cinnamon, cardamom, baking soda and salt, then fold into the wet ingredients using a spatula until just combined.
Spread the batter in the prepared pan, then sprinkle the streusel evenly over the top. Pat the streusel gently to ensure that it will stick to the cake.
Bake for 20-25 minutes or until a wooden skewer inserted in the center comes out clean.
Let the cake cool at least 20 minutes before lifting it out of the pan to cool completely on a wire rack.
Slice and enjoy with a cup of tea. Store leftovers in an airtight container at room temperature for up to 3 days.