Add olive oil, garlic and Swiss chard to large skillet on medium heat and wilt chard, (2 mins)
Place bacon slices on 3 or 4 layers of paper towels on a microwave safe platter, cover with additional layers of paper towels, microwave for 4 mins. to slightly cook the bacon and render some of the fat.
Let the bacon cool slightly, then chop into bite sized pieces.
Preheat oven to 425°.
Lightly oil an 8 by 8 casserole dish.
Place a layer of potato slices in the dish, lightly salt and pepper, then add 1/3 of the bacon, 1/3 of the chard, and 1/3 of the cheese.
Repeat 2 more layers of ingredients.
Pour in the chicken broth, then top with thinly sliced butter, (the butter is optional).
Cover the casserole with foil and bake for 15 minutes.
Remove the foil and bake for an additional 30 minutes until the cheese starts to brown and the potatoes are fork tender.