Prepare the Mushrooms: Warm 1 tablespoon of butter in a skillet over a medium flame. Sauté the mushroom slices for approximately 4 minutes per side until they reach a deep brown color. Incorporate the salt and a dash of Worcestershire sauce, stir briefly, and then set the mushrooms aside.
Cream the Greens: Add more butter to the pan and sauté the onions for about 10 minutes until they develop color. Stir in the heavy cream and mixed greens. Promptly take the skillet off the heat, stirring until the greens are wilted into the cream and onion mixture. Finish by seasoning with salt and pepper.
Cook the eggs. Whisk the eggs thoroughly and add butter to a non-stick pan. Pour in the eggs, swirling them to cover the pan surface. Once the eggs are mostly set, season with salt and pepper, then flip.
Assemble and Serve: Transfer the eggs to a plate. Garnish with the prepared creamed greens, the browned mushrooms, crumbled white cheddar, and fresh jalapeno slices.