medium onion, peeled, cut into quarters, and sliced very thinly
8
thin slices white or whole wheat bread, crusts removed.
4 Tbsp
freshly grated parmesan cheese
How To Make onion toasts
1
Mix together the mayonnaise, mustard, salt, and pepper in a small bowl. Combine 5 tablespoons of the mayonnaise mixture with the sliced onion.
2
Spread the onion mixture on 4 slices of bread and top with the remaining bread. Spread the remaining mayonnaise mixture on the tops of the sandwiches and sprinkle with the Parmesan cheese.
3
Cut each sandwich into quarters and place on a baking sheet. Bake in a preheated 350F (180C) oven until light golden brown, about 15 minutes. Serve immediately.
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