1-Step 1: Saute the Spinach Heat ½ tablespoon olive oil in a skillet over medium heat. Add 1 clove minced garlic and saute about 1 minute until fragrant. Toss in ¼ pound frozen chopped spinach, no need to thaw, and season with salt and black pepper to taste. Saute until most moisture evaporates, about 3-4 minutes. Set aside to cool slightly.

2-Step 2: Prep the Bread Spread 2 tablespoons butter evenly on one side of each of the 4 slices sturdy bread, like sourdough or ciabatta. This step ensures the signature crispy golden crust.

3-Step 3: Assemble the Sandwiches Place two slices buttered-side down on your work surface. Divide 1 cup shredded mozzarella cheese between them. Top each with half the 1 ounce crumbled feta cheese. Divide the cooked spinach mixture evenly over the feta. Add the remaining mozzarella on top of the spinach, then sprinkle a pinch of crushed red pepper flakes on each. Cap with the remaining bread slices, buttered side facing out.

4-Step 4: Cook to Perfection Heat a large skillet over medium-low. Place sandwiches in the pan and cook about 5 minutes per side, pressing gently with a spatula for even contact. Look for golden brown bread and fully melted cheese inside. If needed, cover briefly to help melt.

5-Step 5: Rest, Slice, and Serve Transfer to a cutting board, rest 1 minute, then slice in half. Serve immediately hot for best gooey texture. Pairs great with a side salad.