Step 1: Season the Steak - Add the stew beef to a bowl or lay it out on a cutting board, then season it with the salt, pepper, and garlic powder. I like to toss everything around with clean hands because it helps every piece get coated. This first layer of seasoning matters, since the steak is the heart of the whole dish.
Step 2: Sear the Beef - Heat the oil in a large skillet over medium high heat. Once the pan is hot, add the steak pieces in a single layer and sear them for 1 to 2 minutes per side until lightly browned. You are not cooking the steak through here. You are just giving it that browned flavor that makes the finished slow cooker beef taste deeper and richer.
Step 3: Move the Steak to the Slow Cooker - Transfer the browned steak into the slow cooker. Try to scrape in any little browned bits from the skillet too, because those bits are flavor. This is one of those small dad tricks that makes a simple slow cooker meal taste like you fussed over it more than you did.
Step 4: Add the Cooking Liquid - Pour in the beef broth, then add the Worcestershire sauce, minced garlic, and Italian seasoning. Stir gently so the steak gets nestled into all that savory liquid. The broth keeps things moist, the Worcestershire brings depth, and the garlic slowly works its way into the beef as it cooks.
Step 5: Slow Cook Until Tender - Cover the slow cooker and cook on low for 6 to 8 hours or on high for 4 to 5 hours. The steak is ready when it is tender enough to pull apart easily with a fork. I prefer the low setting when I can manage it, because beef has a way of getting softer and more relaxed when it is not rushed.
Step 6: Cook the Pasta - About 20 to 30 minutes before serving, cook the fettuccine or penne according to the package directions until just al dente. Drain it well and set it aside. Do not overcook the pasta, because it will get tossed in the warm cream sauce and you want it to hold its shape instead of turning soft.
Step 7: Start the Creamy Sauce - Remove the beef from the slow cooker with a slotted spoon and set it aside for a moment. Stir the heavy cream and softened cream cheese into the liquid left in the slow cooker. Take your time here and keep stirring until the cream cheese begins to melt down. The sauce may look a little uneven at first, but it smooths out as it warms.
Step 8: Melt in the Parmesan - Add the freshly grated parmesan cheese and stir until the sauce is creamy and smooth. Fresh parmesan is worth it here because it melts into the sauce instead of sitting there in little stubborn bits. Once the sauce looks silky, you are right where you want to be.
Step 9: Return the Beef and Add Spinach - Add the cooked beef back into the slow cooker, then stir in the fresh spinach. The spinach will wilt quickly in the warm sauce, so there is no need to cook it for long. I like adding it at the end because it brings a bit of color and freshness to all that rich, creamy goodness.
Step 10: Toss in the Pasta - Add the cooked pasta and gently toss everything together until the noodles are coated in the creamy parmesan sauce. Be patient and use a light hand, especially if you are using fettuccine. You want the beef, pasta, and sauce to come together without breaking everything up too much.
Step 11: Finish with Gorgonzola and Tomatoes - Sprinkle the crumbled gorgonzola cheese and chopped sun dried tomatoes over the top. Let them sit for a few minutes so the cheese softens slightly into the warm pasta. This is where the recipe really starts smelling like something you would order at a restaurant.
Step 12: Garnish and Serve - Finish with chopped parsley and a drizzle of balsamic glaze, then serve warm. That little drizzle makes a big difference because it adds sweetness and tang that balances the creamy sauce and bold gorgonzola. Scoop it into bowls, call everyone in, and enjoy the quiet that happens when dinner is really good.