Prepare by preheating the oven to 325°F and lining a 9” cake pan with parchment paper.
To craft the caramel, begin by melting butter and granulated sugar in a medium saucepan over medium heat. Swirl the pot occasionally until the mixture simmers, bubbles, and achieves a rich tan hue. Make sure the sugar is nearly dissolved.
After removing the caramel from the heat, blend it smoothly with heavy cream. Pour this creamy caramel mixture into the cake pan, tilting it to ensure complete coverage at the bottom. Sprinkle slivered almonds on top and set it aside to cool while you get the cake batter ready.
Whisk together flour, spelt flour, baking powder, and salt in a medium bowl. Set aside.
Combine sour cream, eggs, granulated sugar, brown sugar, and vanilla in a large bowl, whisking until the mixture is smooth and light.
As you whisk continuously, slowly stream in the olive oil until the batter is fully homogenized.
Incorporate the dry ingredients by gently folding them in with a rubber spatula until there are no more visible flour streaks.
Gently pour the cake batter over the luscious caramel almond topping in the pan. Bake for 35-40 minutes until the cake's top achieves a rich, deep golden hue, and the edges gracefully detach from the sides.
After just 5 minutes of cooling in the pan, invert the cake onto a plate to ensure the caramel topping doesn't stick to the pan.
Enhance your enjoyment with a rich espresso.