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1 Tablespoon butter, softened
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1 loaf sourdough bread, cubed, divided
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½ red onion, finely diced
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1 pound fresh Ahi tuna, roughly chopped
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2 cups cauliflower florets
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1½ cups frozen peas, thawed
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2 x 10.5-ounce cans condensed mushroom soup
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¾ cup whole milk
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½ cup fresh flat-leaf parsley, chopped, divided
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1 cup shredded Parmesan
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kosher salt
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freshly ground black pepper