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1
Preheat oven to 400 degrees.
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2
Clean portobello mushrooms, remove stems, chop finely and set aside. Scrape out dark gills from the underside with a spoon, taking care not to break the edges of the mushroom caps.
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3
Melt 3 tablespoons of the butter and brush caps all over on both sides. Sprinkle with some of the pepper and the garlic salt. Set on a baking sheet (covered with foil if you want to eliminate messy clean-up) upside down and ready to fill.
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4
Melt the remaining butter (or bacon fat, which is what I used for this step) in a large pan or dutch oven over medium high heat. Saute the garlic for a minute or two until fragrant, then add mushroom stems. Saute for 3-4 minutes until softened, then add the chopped spinach with the remaining pepper and saute until wilted, approximately 2-3 minutes.
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5
Turn heat down to medium low and add the cream cheese, brie and half of the parmesan (save half to top the stuffed caps), yogurt, and chipotle sauce (to taste, we like a bit of spice). Stir to incorporate, cover and allow cheeses to melt for about 5-6 minutes. Check to see if they're melted - if they are, stir again and then add the cheddar. Stir to incorporate, turn off the heat and cover. The cheddar is the binding cheese, which is why you add it last.
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6
After 2 minutes, stir in the pine nuts. Fill the mushroom caps with the spinach/cheese mixture and top with remaining parmesan cheese. Bake for 25 minutes or until the parmesan is lightly browned. Enjoy!
