Spread one side of each bread slice with butter, ensuring you reach all the way to the edges. Set aside.

Lightly mash the avocado with the salt, garlic powder, and black pepper. In a separate bowl, combine the goat cheese and herbs.

For each sandwich, layer 1 bread slice (butter-side down), ¼ of the goat cheese mixture, ½ of the avocado mixture, ½ of the spinach, another ¼ of the goat cheese, then top with the remaining bread slice, butter-side up. Repeat for the second sandwich.

To cook the sandwiches, melt 1-2 tablespoons butter in a large skillet over medium low. Place the sandwiches on top, then cook for 3-4 minutes on the first side until the bread is golden, checking often to see that the bread is cooking nicely and doesn’t burn. Flip the sandwiches to the other side and cook an additional 2-3 minutes, or until the bread is toasted and the centers are hot. Let cool slightly and enjoy immediately.