Gather all your ingredients. Dice the onion and mince the garlic. Slice the mushrooms into thin pieces.
In a large pot, heat the olive oil over medium heat. Add the diced onion and sauté for about 5 minutes until translucent. Stir in the minced garlic and sliced mushrooms. Cook for another 5-7 minutes until mushrooms are tender.
Add the vegetable broth to the pot and bring to a boil. Reduce heat and let it simmer for about 10 minutes.
Remove the pot from heat and let it cool slightly. Blend the soup until smooth using an immersion blender.
Return the blended soup to the pot. Stir in the cottage cheese, dried thyme, salt, black pepper, and lemon juice. Heat over low heat for about 5 minutes until warmed through. Serve hot, garnished with chopped fresh parsley.