Prepare the Mushrooms: Gently remove the stems from the portobello mushrooms.
Using a large spoon, carefully scrape out the dark gills from the underside of the caps and discard them.
Sprinkle the mushroom caps evenly on both sides with salt and pepper.
Marinate: In a small bowl, whisk together the red wine, olive oil, 2 tablespoons (30 ml / 1 fl oz) of the fresh parsley, the fresh oregano, and minced garlic.
Place the seasoned mushrooms in a large resealable plastic bag or a shallow dish and pour the marinade over them. Seal the bag or cover the dish, turning to ensure the mushrooms are fully coated.
Let them marinate at room temperature for 2 hours, turning occasionally.
Grill the 'Steaks': Preheat your grill to medium heat.
Remove the mushrooms from the bag, making sure to reserve all the marinade for the sauce.
Place the mushrooms, cap-side down, on the grill rack.
Grill for 8 to 10 minutes, flipping once halfway through, until they are beautifully browned, tender, and have distinct grill marks.
Create the Cream Sauce: While the mushrooms are grilling, pour the reserved marinade into a small saucepan.
Bring it to a boil over medium-high heat.
Reduce the heat and stir in the heavy whipping cream.
Continue to heat gently for 1-2 minutes until warmed through, but do not let it boil again.
Serve: Once grilled, transfer the portobello mushrooms to a cutting board and slice them into thick strips.
Serve the sliced mushrooms over a bed of hot cooked egg noodles, generously spoon the warm cream sauce over the top, and garnish with the remaining 1 tablespoon (15 ml / 0.5 fl oz) of fresh parsley.
Don't marinate the mushrooms for longer than 2-3 hours. Their porous texture can cause them to become overly soft and break down if left for too long.