Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Clean the portobello mushrooms with a damp paper towel, remove the stems, and gently scrape out the dark gills using a spoon.
Mince the garlic and finely chop the fresh parsley.
Heat the olive oil in a large skillet over medium heat, then add the ground turkey, minced garlic, sea salt, black pepper, and dried oregano.
Sauté the turkey until it is browned and cooked through, breaking it into small crumbles as it cooks.
Add the fresh spinach to the skillet and stir for 1-2 minutes until the leaves are completely wilted.
Place the mushroom caps on the prepared baking sheet, gill-side up, and divide the turkey and spinach mixture evenly between the two caps.
Crumble the goat cheese over the top of the turkey filling.
Bake in the oven for 15-18 minutes until the mushrooms are tender and the cheese is soft and slightly golden.
Remove from the oven and garnish with the freshly chopped parsley before serving hot.