Preheat your air fryer to 320°F (160°C) for about 5 minutes. Grease a 7-inch round cake pan or line it with parchment paper to prevent sticking.
In a mixing bowl of a stand mixer, beat the eggs and sugar together until light and fluffy, for about 3-4 minutes. You can also use a hand held mixer if you don't have a stand mixer.
Add the vegetable oil, yogurt, lemon juice, and vanilla paste, whisk until they all mixed nicely without over mixing it.
In a separate bowl, mix together the self raising flour, baking powder, and lemon zest. This ensures the leavening agents are evenly distributed throughout the batter, giving your cake a nice rise.
Add the dry ingredients to the wet ingredients, mix until the batter is smooth but be careful not to overmix. I use a hand whisk or a spatula at this stage.
Gently fold in the chocolates to distribute them evenly through the batter.
Pour the batter into the prepared cake pan, add the raspberries, and smooth the top with a spatula.
Place the pan into the preheated air fryer basket. Cook at 320°F (160°C) for 30-35 minutes, or until a toothpick inserted in the center comes out clean.