1 20-ounce bag frozen shredded hash browns, thawed
4 cloves garlic, smashed and thinly sliced
Kosher salt
5 tablespoons extra-virgin olive oil, us more for drizzling
1/2 cup pitted Spanish green olives, roughly chopped
3/4 pound tomatoes, cut into 1-inch pieces
1/4 cup diced roasted red peppers
3 scallions, white and light green parts only, chopped
2 tablespoons chopped fresh parsley
1 1/2 pounds skinless tilapia fillets
1 teaspoon herbes de Provence or dried rosemary
Freshly ground pepper