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heat oven to 450 degrees.
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arrange sausage in a single layer on a quarter-size rimmed baking sheet or in a 9-by-13-inch roasting pan, and roast until golden on the bottom, about 15 minutes.
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toss broccoli with oil, red pepper flakes and salt on a quarter-size rimmed baking sheet (or use a regular sized rimmed baking sheet), and place in oven.
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After you flip the sausages over so browned sides are on top.
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when you flip the sausages, remove broccoli from oven and toss with sliced garlic. (reserve grated garlic for later.)
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drizzle broccoli with a little more oil.
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return pan to oven and continue to roast broccoli and sausages until sausages are cooked through and broccoli is tender and browned, about 5 minutes longer.
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meanwhile, mix ricotta with grated garlic.
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top sausage with tomato sauce and dollops of ricotta, then drizzle with olive oil and grind pepper generously over top.
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sprinkle on mozzarella and parmesan.
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bake until cheese is melted and bubbly, and the garlic is opaque, 3 to 5 minutes.
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serve sausages, sauce and cheeses with broccoli on the side.