Spread one side of each piece of bread with 1 tablespoon of spreadable butter and place (butter-side down) on a cutting board. Cut each piece in half.
Spread 2 tablespoons of hummus on the top side of 4 pieces. Top with peppers, olives, pepperoncini.
Place bread with toppings on the panini press, buttered side facing down on the press. Finish your sandwich by sprinkling on feta cheese and adding the spinach or arugula. Completing the assembly of the sandwich on the press helps keeps the sandwich intact before you press it. Place the second piece of bread on top.
Close press to cook, following the manufacturer’s instructions.
Once the outside is nice and toasty, remove from the press and cut in half.
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