Bring a large pot of salted water to a boil and cook the pasta according to package directions until al dente.
Season steak strips with salt and pepper. Heat olive oil in a large skillet over medium-high heat.
Sear the steak strips for 2-3 minutes per side until browned and cooked to desired doneness. Remove steak from the skillet and set aside.
Reduce heat to medium and melt the butter in the same skillet. Add the shallot and garlic, sautéing for 2 minutes until translucent and fragrant.
Pour in the heavy cream and stir in the oregano. Bring to a light simmer for 3-5 minutes until the sauce begins to thicken.
Whisk in the Parmesan cheese until melted and the sauce is smooth.
Add the fresh baby spinach to the sauce and stir until wilted.
Incorporate the cooked pasta and seared steak into the skillet. Toss thoroughly to coat the ingredients in the cream sauce.
Garnish with fresh parsley and serve immediately.