Peel the potatoes and onions and cut the first into cubes and the second into slices.
Put the butter and onions in a saucepan and let them soften, then add the potatoes, cover with the broth and cook for at least 30 minutes with the lid on.
Remove the lid, season with salt and pepper, add the sifted flour and continue cooking until you get a thick and creamy soup, with well cooked potatoes.
The onion and potato soup is ready, serve it immediately with the croutons.
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