Creating the Savory Onion Bake with Butter and Herbs is straightforward if you follow these steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Sauté Onions: In a large skillet, melt the butter and olive oil over medium heat. Add the sliced onions and cook until they are soft and caramelized, about 20 minutes.
3. Add Herbs: Stir in the thyme, rosemary, garlic powder (if using), salt, and pepper. Cook for an additional 2 minutes to let the flavors meld.
4. Prepare Baking Dish: Grease a medium-sized baking dish with butter or cooking spray.
5. Layer Onions: Spread the caramelized onion mixture evenly in the prepared baking dish.
6. Mix Cream and Eggs: In a bowl, whisk together the heavy cream and eggs until well combined. Season with salt and pepper.
7. Pour Mixture: Pour the cream and egg mixture over the onions, ensuring everything is evenly coated.
8. Add Cheese: Sprinkle the grated cheese on top of the mixture.
9. Bake: Place the dish in the preheated oven and bake for 30-35 minutes or until the top is golden brown and the center is set.
10. Cool and Garnish: Allow the bake to cool for about 10 minutes. Garnish with fresh parsley before serving.

These steps will guide you in creating the Savory Onion Bake effortlessly, allowing you to enjoy a dish that truly impresses.