First, put the butter, onion, garlic, and potato in a pan;

Once everything is sauteed, add the spinach and stir everything very well;

When the potatoes have softened and the spinach has wilted, add the salt and seasonings;

Then pour the mixture into a blender and beat it all very well;

Put the soup back in the pot over low heat;

Take the opportunity to check how she likes it;

When the flavor and temperature are ideal, turn off and serve.