Cook the onion and tomatoes

• Put the chopped onion in a pan and cook until softened.
• Add the canned tomatoes, season with pepper and a little salt, and let it cook down.

Add mushrooms and beans

• Add the sliced mushrooms and cook until they soften.
• Stir in the drained butter beans.

Make it creamy

• Mix the sour cream with the Greek yogurt.
• Stir some of the mixture into the pan.

Wilt the spinach and serve

• Add the spinach and stir until wilted.
• Serve with the cooked fingerling potatoes.