Preheat the oven to 350°F (180°C). Grease a 9-inch round cake pan with butter or cooking spray.
In a large mixing bowl, crumble the queso fresco or farmer's cheese into small pieces.
Add the sweetened condensed milk and mix until well combined.
Beat the eggs in a separate bowl and add them to the cheese mixture, stirring until smooth.
Stir in the melted butter, cornstarch, baking powder, vanilla extract, and salt. Mix until well combined and smooth.
Add the raisins (optional) and stir until evenly distributed.
Pour the mixture into the prepared cake pan and smooth out the top with a spatula.
Bake for 45-50 minutes or until the edges are golden brown and a toothpick inserted in the center comes out clean.
Allow the cake to cool for 10-15 minutes before slicing and serving.
Notes
Tips and Tricks
To prevent the cake from sticking to the pan, line the bottom with parchment paper.Make sure all ingredients are at room temperature before mixing.To make the cake fluffier, beat the egg whites separately until stiff peaks form and then fold them into the batter.If the cake browns too quickly on top, cover it with foil for the last few minutes of baking.