Don't worry if you don't have a panini press. I don't! Honestly, you can substitute a regular skillet and a cast iron pan nested inside of one another to make this.
3 bell peppers, sliced into strips (I used 2 red and 1 orange)
1 sweet large onion, diced
8 oz. button mushrooms, sliced
Mozzarella, shredded
Basil pesto (we used
this prepared
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