To cook the bacon, position the oven rack in the center of the oven, and preheat the oven to 400°. Cover a large rimmed baking sheet with heavy-duty aluminum foil, and line it with the bacon. Cook the bacon for 15 to 20 minutes, or until it is crispy.
Use a fork or tongs to remove the bacon to a paper towel–lined plate to drain. Discard the bacon grease, and chop the bacon. Cover and refrigerate half of the chopped bacon, and put the rest of it in the bottom of a large slow cooker.
Add the black-eyed peas, garlic, thyme, bay leaves, and pepper to the slow cooker. Pour in the chicken broth, and stir to combine. Cover the slow cooker and cook on low for 6 to 8 hours, until the black-eyed peas are tender. Discard the bay leaves. Season with salt and pepper to taste, and stir in parsley. Serve bowls of black-eyed peas topped with the reserved chopped bacon after reheating it.