Place pasta in Multipurpose Steamer. Stir in 4 cups water. Cover; microwave on high until al dente, 12 min.
Meanwhile, heat oil in a large fry pan or wok over medium-high heat. Crumble in beef; cook, breaking up meat using the Ground Meat Separator, until meat is cooked through, 3–5 min.
Stir in seasoning and tomatoes; bring to a boil. Reduce heat and simmer, 5 min.
Once cooked, drain pasta, then add to pan. Stir in peas and spinach until warm, 1 min. Taste and season with salt and pepper, if desired.
To serve, spoon into bowls. Add toppings, if desired.