Creamy Mushroom Pasta with Carmelized Onion and Spinach

Ingredients:
1 tablespoon olive oil
3 medium onions, sliced
1 tablespoon balsamic vinegar
Pinch of salt

1 tablespoon olive oil
10-15 small mushrooms, sliced

3 cups spinach

8 oz fettuccine pasta
2/3 cup heavy cream
1/3 cup milk
1 cup grated parmesan cheese
1/4 teaspoon salt

Heat 1 tablespoon of olive oil in large skillet. Add sliced onions and cook on high heat about 10 minutes or until onions are browned. In other pan, heat 1 tablespoon olive oil and add sliced mushrooms, cook on medium-low for about ten minutes and stir occasionally. Reduce heat on the onions to medium and cook another ten minutes. Add a pinch of salt and cook another ten minutes. Remove from heat and sprinkle onions with balsamic vinegar, mix together and scrape bottom of pan.

Cook pasta according to package instructions. 

Add mushrooms to the pan with the onions. Add 3 cups of spinach and stir on low heat until the spinach wilts.

Add heavy cream, milk, parmesan cheese, and salt to the pan. Mix on medium-low heat. Add pasta to the sauce, and stir on low heat for 5-10 minutes. Serve warm.