Lay out all 12 slices of bread and spread each with a heaping tablespoon of pesto. Sprinkle 6 of the slices with chopped bell peppers and top with remaining 6 slices.

Press down lightly to secure and trim the crusts off all 4 edges. Cut in half at a diagonal to form 2 triangle sandwiches.

Can be made up to 2 hours in advance if wrapped tightly in plastic wrap and refrigerated.