Portabella Burger recipe

Wipe with a damp towel 2 Portabella mushroom caps. Slice thick 1/2 red onion and 1/2 c red pepper. Pan grill with 2 T olive oil, 2 T balsamic vinegar, 2 t oregano, 1 clove garlic, salt, and pepper for 4 minutes per side. Toast bread. Layer spinach, grilled veggies, 2 oz. mozzarella, and more spinach. Spray toast with pam then press between two hot and heavy pans.