Transform marinara into an Indian-style simmer sauce for shrimp with the help of garam masala, fresh ginger, and scallions. Serve atop steamed couscous for a quick yet satisfying weeknight dinner.
In a large skillet, heat 1 tablespoon oil over medium-high. Season shrimp with salt and pepper; sprinkle with garam masala. Add to skillet in a single layer and cook, flipping once, until opaque, about 3 minutes; transfer to a plate.
Reduce heat to medium; add remaining 1 tablespoon oil and swirl to coat. Add onion and ginger; cook, stirring, until onion is tender, about 8 minutes. Season with salt and pepper. Add marinara; simmer until slightly thickened, about 5 minutes. Remove from heat; stir in cream and shrimp with any accumulated juices. Season with salt and pepper. Serve over couscous, topped with scallions.