Cook tortellini according to directions, reserving ½ cup water.
Brown sausage in a large nonstick skillet, stirring occasionally, 7 minutes. Add fennel, shallots and pepper flakes, stirring until softened, 4 minutes. Add wine; simmer until evaporated slightly, 3 minutes.
Add half & half and marinara; simmer, 5 minutes. Add tortellini, Parmesan, basil and fennel fronds. Stir to coat. Adjust sauce with reserved pasta water.
Divide into serving bowls.
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