Prior to making this dip, leave the cream cheese on the counter to soften.
Preheat oven to 350°F.
Remove the stem of the baby bella mushrooms and slice them.
Heat avocado oil, minced garlic, and thyme in a cast iron skillet over medium-low heat. Cook until soft and fragrant, about 3 minutes.
Add the mushrooms to the cast iron skillet and cook, tossing frequently until slightly soft, about 7 minutes. Salt the mushrooms and remove from heat.
Allow the mushrooms and cast iron to cool slightly.
While the mushrooms cool, mix softened cream cheese, Greek yogurt, and 1/2 cup Parmesan cheese in a bowl.
Mix the cheese mixture with the cooked mushrooms in the skillet and top with another 1/2 cup of Parmesan cheese.
Place the skillet in the oven to bake for 15 minutes.
Increase the heat to broil and broil for 5 minutes or until the Parmesan is browned and bubbling.
Remove the skillet from the oven and enjoy with toasted baguette, crackers, or veggies!