Place the butter in a small saucepan on the stove over medium-low heat and let the butter melt.
½ cup unsalted butter
Once melted, the butter should begin to foam and sputter. Use a rubber spatula or wooden spoon to stir occasionally. You'll start to see white milk solids at the bottom of the pan. Once the butter stops sputtering, the milk solids should turn golden brown and it will smell nutty and toasted. Pour the brown butter (making sure you scrape all the little brown bits of butter out!) into a large bowl and let cool.
While the brown butter cools, mix together all of the streusel ingredients in a small bowl. Use your fingers or a fork to smush the softened butter with the dry ingredients. It'll take a few minutes but you want it to form clumps and there should be no dry patches! Set aside.
½ cup all-purpose flour, ¼ cup light brown sugar, ½ cup rolled oats, 1 teaspoon ground cardamom, ¼ cup sliced almonds, ¼ cup unsalted butter
Preheat the oven to 350°F/175°C. Grease an 8-inch springform pan and line with parchment paper.
Whisk the eggs into the browned butter.
2 large eggs
Add the vanilla and almond extract along with the sugar
1 cup granulated sugar, 1 teaspoon vanilla extract, ½ teaspoon almond extract
In a separate bowl, whisk together the flour, ground almonds, cardamom, baking powder, and salt.
1 ¼ cup all-purpose flour, ½ cup ground almonds, 1 teaspoon baking powder, 3 teaspoons cardamom, ½ teaspoon kosher salt
Add the flour in three additions, alternating with the buttermilk, starting and ending with the flour.
½ cup buttermilk
Pour the batter into the pan and then sprinkle your streusel on top.
Bake for 40-50 minutes.
Your cake is ready when a toothpick inserted comes out clean. Let the cake cool in the pan for 10 minutes before removing to a wire cooling rack to cool completely.
Once the cake is cool, whisk the maple glaze ingredients together. If the glaze is too thick, add a drop more heavy cream or milk. If it's too thin, add more sifted icing sugar. Drizzle on top of your cake and enjoy!
½ cup confectioners' sugar, 1 tablespoon maple syrup, ¼ teaspoon vanilla extract, pinch salt, 1 tablespoon heavy cream
Notes
My recipes have been developed and tested in metric grams. I highly recommend using a weighing scale and measuring out your ingredients the metric way. I have provided a conversion to US cups but please note that I haven’t tested the recipe with this method. Just click on 'US Customary' above the ingredients.Salt: If you don’t have kosher salt, halve the amount of salt called for in the recipe. 1 teaspoon kosher salt = ½ teaspoon fine salt. Note that I'm using Diamond Crystal kosher salt and not Morton Salt which is saltier. Buttermilk: swap out buttermilk for sour cream. Topping: if you don't want to add the streusel topping, just sprinkle over ¼ cup of slivered almonds and some sparkling sugar.Cake Pan: I recommend using a springform pan, but if you don't have one you can use a regular round pan. Just note that some of the streusel might come off when you flip it upside down on the cooling rack. Flip it upside down on the rack, then turn the cake right side up on the cooling rack. Storage: Cover the cake tightly and keep it at room temperature for up to 5 days. Freezing: Freeze for up to 2 months, let the cake defrost overnight in the fridge and then come to room temperature when you’re ready to eat it.