Sun-dried tomatoes have rich umami flavor which makes a great foundation for this simple tomato soup. Smarts: Use any type of tortellini you'd like here - a cheese or meat filling would both be great. If you make the soup ahead, just wait to stir the tortellini in until right before serving.
Heat a Dutch oven over medium-high heat. Add oil and then onions. Saute until onions are soft, 3 to 4 minutes.
Add garlic and sun-dried tomatoes. Saute for 1 minute.
Add tomatoes (including liquid) and stock. Bring to a simmer. Simmer for 5 minutes.
Optional step: If you’d like a smooth soup base, puree the soup with an immersion blender.
Add zucchini and mushrooms to soup. Reduce heat to a low simmer and cover soup with a lid. Simmer until zucchini and mushrooms are tender, ~10 minutes.
Remove soup from heat and stir in tortellini and lemon juice. Season with some salt and pepper.
Divide soup between serving bowls. Top soup with yogurt and basil. Enjoy!