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PREHEAT oven to 350°F.
COOK bacon in a medium skillet over moderately high heat until the fat is rendered, 3 to 5 min. Transfer bacon to paper towels, keeping the drippings in the skillet. Add the butter along with the garlic and 1/2 of the shallots to skillet. Cook over moderate heat until softened, about 2 min. Add cream cheese, Havarti, and whisk in heavy cream. Simmer until reduced by half, about 8 min. Season with salt and pepper.
HEAT a large skillet over moderate heat. Add olive oil and saute Swiss chard leaves with the remaining shallots until softened, about 3 min. Season with salt and pepper. Transfer chard leaves to a shallow baking dish and cover with the cream cheese mixture. Top with panko and crumbled bacon. Bake until crumbs are toasted and the casserole is bubbling, about 30 min.