Easy Spanakopita Style Sandwiches Recipe

Name: Easy Spanakopita Style Sandwiches Recipe
Ingredients: 1 1/2 tbsp butter; 1/4 cup finely chopped onion; 1 or 2 cloves garlic, minced; 10 oz package of frozen chopped spinach, thawed and squeezed dry; 4 oz crumbled feta cheese; 1/4 tsp dried oregano; Pinch of ground nutmeg; Salt and pepper, to taste; 8 slices of your favourite bread (i like thick, texas toast style); 8 slices (1 oz each) monterey jack or provolone cheese