One-Pot Beef & Veggie Pasta

Heat olive oil in a large pot over medium-high heat.

Add ground beef and cook, breaking it apart, until browned, about 3 minutes.

Add sliced red onion, diced yellow bell pepper, and chopped tomatoes to the pot.

Stir in penne pasta, salt, black pepper, and water or broth.

Bring to a boil, then reduce heat and simmer uncovered, stirring occasionally, until pasta is al dente and liquid is mostly absorbed, about 8-10 minutes.

Stir in mozzarella cubes and fresh basil leaves just before serving.

Serve hot, garnished with extra basil if desired.