Bring a pot of salted water to a boil and cook the chickpea pasta according to package directions until al dente.
Heat the extra virgin olive oil in a large skillet over medium-high heat until shimmering.
Season the beef sirloin strips with sea salt and black pepper, then sear in the skillet until browned on all sides.
Remove the beef from the skillet and set aside; add the diced yellow onion and sliced cremini mushrooms to the same pan.
Sauté the vegetables until the mushrooms are golden brown and the onions are translucent and soft.
Stir in the minced garlic and cook for 60 seconds until the aroma fills the kitchen.
Pour in the beef broth and Dijon mustard, whisking to deglaze the browned bits from the bottom of the skillet.
Reduce the heat to low, return the beef to the skillet, and fold in the Greek yogurt until a smooth, creamy sauce forms.
Add the cooked chickpea pasta to the skillet, tossing to coat every noodle, and garnish with fresh chopped parsley before serving.