Clean tomatoes and spread on a foil-lined cookie sheet or air fryer basket
Add peeled and sliced onion
Use the Air Fry setting or roast for 5 minutes at 400 °F
After 5 minutes, shake the tomatoes and roast for another 5 minutes or until soft and popping
Add tomatoes and onions to a medium saucepan with other ingredients, excluding yogurt. Bring to a boil over medium high heat and reduce to a simmer for 10 minutes
Add to a blender and carefully blend on a low speed until smooth.
After blending, return soup to saucepan to reheat and stir in Greek yogurt