Defrost frozen spinach and drain very well. Grate the parmesan. Roast pine nuts without fat. Take out and let cool down. Wash basil, shake dry and chop finely
Butter a 12-cup muffin tin. Melt 60 g butter. Beat hot butter, milk and eggs together with a whisk. In a second mixing bowl mix flour, baking powder, sugar and salt. Using a rubber spatula or wooden spoon, add the liquid ingredients to the flour mixture and stir only until the two mixtures have combined just enough
Carefully fold in ricotta, nuts, spinach and all the herbs. Do not stir excessively! Spread the dough evenly into the muffin tin. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 16-18 minutes. Make a cooking test with a wooden skewer. Let the muffins rest in their form for 10 minutes, then remove them and let them cool completely on a cake rack