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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Wash and dry produce.
Dice tomato. Peel and mince garlic.
Place flatbreads on a baking sheet. (For 4, divide flatbreads between two sheets; toast on top and middle racks, swapping rack positions halfway through.) Brush each flatbread all over with a drizzle of olive oil. Toast on top rack until golden, 8-10 minutes.
Heat a drizzle of oil in a large pan over medium-high heat. Add sausage and cook, breaking up meat into pieces, until browned and cooked through, 4-6 minutes. Turn off heat. Using a slotted spoon, transfer sausage to a paper- towel-lined plate.