In a medium pot on medium-high heat, add the olive oil, mushrooms, onion cubes and thyme. Saute until the mushrooms are tender and wilted, 8 to 10 minutes. Season with salt and pepper. Add the peppers and cook until they soften, 4 to 5 minutes.
Add the mustard and move it around the pot so it basically coats everything and disappears. Add the stock and beans. Lower to a simmer and cover. Let cook, 15 to 20 minutes.
Remove the sprig of thyme, then add the kale, if using, and stir. Serve with a spritz of lemon and a shake of hot sauce.
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