Creamy cake with 3 yogurts and 2 eggs

Ingredients:
3 plain yogurts (approx. 125g each)
2 eggs
150g sugar
100g flour
1 sachet baking powder (approx. 10g)
50ml oil (sunflower or olive oil)
1 teaspoon vanilla extract (optional)
A pinch of salt
Zest of 1 lemon or orange (optional, for a more intense flavor)
Instructions: