Preheat the oven to 325°F.
grease and line a 9” spring-form cake pan with parchment paper. Mix the dry ingredients: almond flour, oat flour, baking powder, spices if using and salt into a large mixing bowl and whisk together. Be sure to break up any clumps.
In a separate bowl, add the 3 whole eggs and beat on medium-high speed with a hand mixer or in the bowl of a standing mixer till the volume of the beaten eggs has increased, and the texture has gone from liquid to thick and foamy (like the foam of a cappuccino). The color will be light yellow (~ 5 minutes). Add the honey and olive oil into the foamy eggs and beat the mixture until thoroughly combined.
Add half the sliced almonds to the batter. Fold the wet mixture into the dry ingredients with a silicone spatula till smooth and homogenous. Pour the batter into the prepared pan and sprinkle the remaining almond slices evenly on top.
Bake for 30-40 minutes, until golden brown on top, firm, and a toothpick comes out clean or with a few crumbs.
Let cool in the pan for 10 minutes before removing the cake. Enjoy with fresh berries and whipped cream (recipe follows).