Preheat your oven to 350°F (180°C).
Add and mix well in a bowl: first egg and sugar, after a good stir, the oil, the ricotta, the orange zest and the orange juice.
Incorporate the dry ingredients: sift in flour, baking powder, and salt, then gently fold until the batter is smooth.
Pour the batter in a buttered loaf pan, add some orange slices on top and bake for 50 minutes at 180°.
Check if it is well cooked using a toothpick: if it comes out dry it is time to take our spongy ricotta orange cake out of the oven.
Wait until it cools off before serving and enjoy it with a cup of your favorite tea.