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

In a skillet over medium heat, cook the ground beef until browned. Drain excess fat.

Add the taco seasoning and diced tomatoes to the skillet. Stir to combine and cook for an additional 5 minutes.

Reduce heat to low and add the cream cheese and sour cream to the meat mixture. Stir until melted and combined.

Add the cooked pasta to the skillet and mix until the pasta is well coated with the sauce.

Stir in the shredded cheddar cheese until melted and creamy.

Serve hot, garnished with chopped green onions and jalapeños if desired.