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Position oven racks in upper and lower thirds of the oven. Preheat oven to 400°F. Line one rimmed large baking sheet with aluminum foil (wide heavy-duty foil recommended).
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Place slices of bacon on foil-lined baking sheet.
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Place tomatoes on a separate rimmed baking sheet. Drizzle olive oil over tomatoes and sprinkle with salt and pepper. Toss tomatoes to coat with oil.
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Put both baking sheets in the oven and bake for about 20 minutes.
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Remove tomatoes when skins begin to pop.
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Remove bacon when crispy or cooked to desired tenderness.
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Transfer bacon to a paper towel lined plate. Discard bacon grease or save for another purpose. Discard foil. Crumble bacon.
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Stir together goat cheese, garlic, and half-and-half in a small bowl until combined and smooth.
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Cut French bread in half both vertically and horizontally. Place bread slices on baking sheet.
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Toast French bread in the oven until lightly browned on the edges, about 10 minutes.
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Spread goat cheese mixture on toasted bread slices. Be careful handling hot toasted bread.
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Top with crumbled bacon, arugula, and roasted tomatoes.