Easy, Keto Low-Carb Chicken Broccoli Cheese Casserole

Ingredients (14)

• 1 teaspoon olive oil
• 1 cup chopped onion
• 2 garlic cloves, minced
• 1 1/2 pounds skinless chicken breasts
• McCormick's Montreal Chicken Seasoning
• salt and pepper to taste
• 2 tablespoons butter
• 1/2 tablespoon xanthan gum
• 1 1/2 cups chicken broth
• 1/4 cup heavy whipping cream
• 4 oz cream cheese
• 15 oz frozen broccoli
• 1 cup shredded cheddar cheese
• 1/4 cup shredded parmesan cheese