scalloped sweet potatoes with chard

I saw this recipe over at Tasty Kitchen and made it for Hallowe'en night. I made it ahead and called D to put it in the oven to warm up once shark boy and I were headed home. It was good but a bit bland so next time I'll add more spice to the sauce and maybe roast the potato slices rather than boil them.

Scalloped Sweet Potatoes with Chard (adapted from tasty kitchen)

2 large sweet potatoes, sliced
2 strips of bacon

1 medium onion, sliced

2 1/2 tbsp flour

salt and pepper

2 c milk

1 1/4 c parmesan crumbles

1 bunch of chard, stems removed, sliced thinly

Peel the potatoes and cut into thick slices. Steam until fork tender and drain well.

Meanwhile saute the chard in a saute pan until wilted. Remove from the heat and set aside. Slice the bacon into 1/2" slices and heat in a saute pan. Once the fat is rendered, add the onion slices and cook for about 5 minutes. Add in the flour and milk and whisk to form a sauce. Season with salt and pepper and stir in the wilted chard and distribute evenly through the sauce.

In a greased baking dish (I used a 9x13) form a layer with half of the potatoes. Pour half the sauce over this. Repeat with the remaining potatoes and sauce. Sprinkle the parmesan over the top

and bake at 350 deg F until golden brown and bubbly or about 30 minutes.