Golden, crisp waffles take the place of bread in this playful twist on a classic grilled cheese. Each bite delivers a satisfying crunch that gives way to gooey, melted mozzarella, its creamy richness perfectly balanced by fresh, tender spinach. A bold swipe of spicy mustard cuts through with tangy heat, waking up the palate and adding just the right kick. The harmony of textures—crispy waffle edges, stretchy cheese, and leafy greens—makes this sandwich both comforting and adventurous, a fusion of breakfast indulgence and savory satisfaction.
Preheat a waffle iron according to manufacturer's instructions.
Arrange tomato slices on a work surface, pouring off any excess juice. Season tomato slices with salt and pepper.
Spread 1/2 teaspoon butter onto 1 side of each bread slice. Lay 1 bread slice, butter-side down, in the hot waffle iron. Spread 1/2 teaspoon mustard onto bread slice in waffle iron; top with 1/4 cup spinach, 2 slices mozzarella cheese, 1 teaspoon onion, half the tomato slices, and 1/4 cup spinach, respectively. Lay 1 slice bread, butter-side up, atop the spinach layer.
Close waffle iron and toast sandwich until lightly browned, about 2 minutes. Repeat with remaining ingredients.

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