Grease the hollows of the muffin baking tray. Heat up the frozen spinach for about 5 minutes in a pot. Then defrost in a sieve and drain very well. Grate the parmesan. Roast pine nuts in a pan without fat until golden brown.
Take it out. Wash basil, shake dry, pluck off leaves and chop finely.
Preheat oven (electric cooker: 180 °C/circulating air: 160 °C/gas: see manufacturer). Melt butter in a pot, let it cool down a little. Mix flour, baking powder, sugar and salt in a bowl. In another bowl, beat the liquid butter, milk and eggs with the whisk of the mixer until frothy.
Gradually stir the flour mixture into the liquid ingredients with a dough scraper. Attention! Stir only briefly until both mixtures have just combined. This makes the spinach muffins ingeniously fluffy.
Carefully fold the ricotta, spinach, pine nuts, basil and herbs into the dough with a dough scraper. Do not stir excessively! Spread the dough evenly over the hollows of the muffin baking tray.
Bake in a hot oven for 16-18 minutes. Do not forget to test the chopsticks! Is the dough still moist on the wooden skewer? Bake the muffins for another 3 minutes. If crumbs stick to it, the muffins are ready.
Remove and let it cool down.