Garlic Bread Panzanella Salad

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4 thick-cut slices sourdough bread, cut 1-inch thick

1/4 cup olive oil, plus more for brushing the bread 

1 to 2 garlic cloves 

6 tablespoons Parmesan cheese, grated 

1 small red onion, thinly sliced 

1 avocado, sliced 

1 lemon, juiced and zested 

1 bunch chives, thinly sliced 

Kosher salt and freshly ground black pepper 

2 heads little gem lettuce, washed and cored