Slow Cooker Chicken Tetrazzini

1 1/2 lbs boneless, skinless chicken breasts
1/2 tsp salt
1 tsp garlic powder
1/4 tsp black pepper
1 1/2 tsp dried tarragon or oregano
1 cup diced white onion
2 cups sliced mushrooms
1 cup chicken broth
8 oz cream cheese, cubed
1/2 lb spaghetti or linguine, cooked per package instructions
8 oz shredded mozzarella or parmesan cheese

Instructions:
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