For the hummus, place the drained garbanzos, lemon juice, garlic, cumin, and olive oil in a food processor. Process until blended, about 1 minute. Refrigerate overnight. Bring to room temperature before making the bruschetta.
Spread a teaspoon of butter on each slice of ciabatta; sprinkle with a teaspoon of Parmesan cheese. Place under broiler until slices are golden, about 3 minutes. Remove from oven and spread with a generous tablespoon of hummus. Sprinkle with a dusting of paprika.
To serve, top with tomato slices, feta cheese, and a sprinkle of the oregano and garlic powder.
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