Prepare Goat Cheese Spread: In a small bowl, combine goat cheese, chives, olive oil, garlic, and onion powder until smooth and creamy.

Make Spinach Omelet: Whisk eggs and salt together. Heat olive oil, add spinach, and sauté until wilted. Pour in eggs and cook, pushing uncooked edges toward the center until set.

Slice Omelet for Sandwiches: Transfer omelet to a cutting board and slice into 4 equal squares.

Assemble Sandwiches: Toast English muffins, spread goat cheese on each half, layer with omelet, tomato slices, onion, and avocado.

Serve or Store: Enjoy immediately or wrap sandwiches and freeze for later use.