Creamy Spinach Pasta with onion

1 lb penne pasta 1 tablespoon olive oil 1 cup red onion , diced 2 garlic cloves , minced 8 ounces baby portabella mushrooms , sliced 1 1/2 cups frozen chopped[...]

400 g pasta , 400gm cooked with seasonings and oil, al dente, drained 1 Put a pan of water to boil, when boiled add salt or seasoning and about 2 tbsp oil[...]