Cauliflower and Bacon Gratin

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Unsalted butter, for dish, plus 1/2 stick (4 tablespoons), cut into 1/2-inch pieces

3 slices day-old sourdough bread or 2 cups bread crumbs

3/4 cup heavy cream

1 teaspoon all-purpose flour

1/4 cup capers, rinsed and drained

8 ounces bacon, cooked until crispy and cut into 1/2-inch pieces

1 cup grated Gruyere, divided

Kosher salt and freshly ground black pepper

1 pound cauliflower, trimmed and cut into florets

Olive oil, for drizzling