Heat a large skillet over medium heat. Add in diced bacon and cook until crispy, about 12 minutes. Do not drain grease*. Stir in flour until completely dissolved, about 3 minutes. Add in garlic and saute 60 seconds. Pour in chicken broth, half and half, black pepper, and nutmeg. Bring to a boil and let simmer until thickened, about 3 minutes.
Place green beans into a lightly greased 9x13 pan. Pour bacon mixture over the green beans and toss to coat. Bake in the 450 degree oven for 15 minutes.
Remove from the oven and sprinkle the fried onions over the top. Return to the 450 degree oven for 5 minutes before serving.
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Notes
*If you'd like to reduce the amount of fat in this recipe you can reduce the amount of bacon grease by reserving just two tablespoons and draining the rest.