Put the dark chocolate in a bowl, then place it on top of a saucepan with simmering hot water.
Once the chocolate has melted, set the bowl aside to cool.
Preheat your oven to 175°C (350°F).
Prepare a 9-inch cake pan by lining it with parchment paper, greasing it with butter, and dusting it with flour.
Strain and mix the all-purpose flour, baking powder, baking soda, cocoa powder, and salt.
Use a separate and larger mixing bowl to combine one egg, one yolk, and sugar.
Mix until creamy, then add the yogurt and olive oil and continue mixing.
Pour the cooled melted chocolate and almond extract, then mix.
Add almond flour and the strained dry ingredients from earlier, and mix just enough to combine.
Pour your chocolate cake batter into the prepared cake pan.
Use an angled spatula to even the top of the cake, and tap the pan on the counter to remove bubbles.
Place your cake pan in the middle of the oven for thirty to thirty-five minutes or until a toothpick comes out clean when inserted.
Remove from the oven and set aside to cool for at least fifteen minutes.
Transfer your chocolate cake into a serving plate --- and enjoy!