Creamy Potato and Leek Soup

Ingredients

• 2 leeks
• 1 yellow onion
• 4 cloves garlic
• 4 medium diced yukon gold potatoes
• 59.5 ml cream
• 0.75 cup greek yogurt
• 150 ml vegetable broth
• 1 leaf thyme
• 1 Tbsp olive oil
• some butter
• salt and pepper