Bring a large pot of salted water to a boil. Add the whole wheat pasta and cook according to package instructions until al dente. Drain and set aside.

In a skillet, heat olive oil over medium heat. Add minced garlic and sauté for 1 minute until fragrant. Add ground beef, salt, and black pepper. Cook until browned, about 5-7 minutes.

Reduce heat to low and stir in Greek yogurt, beef broth, dried oregano, and chopped spinach. Cook until spinach wilts and sauce is heated through, about 3-5 minutes.

Add the cooked pasta to the skillet and toss to combine with the creamy beef sauce. Cook for an additional 2 minutes to heat through. Serve warm.