Step 1

Arrange rack in upper third of oven. Preheat broiler to high. Line a rimmed baking sheet with foil.

Step 2

Place salmon skin-side down on the prepared baking sheet. Sprinkle with 1/4 teaspoon each salt and pepper. Broil, rotating once from front to back, until opaque in the center, 8 to 10 minutes.

Step 3

Meanwhile, heat oil in a large skillet over medium-high heat. Add shallot and cook, stirring, for 1 minute. Whisk cream, broth, cornstarch, garlic powder and the remaining 1/4 teaspoon each salt and pepper together in a measuring cup. Add to the skillet and cook, stirring, until starting to thicken, about 2 minutes. Add spinach and artichoke hearts; cook, stirring, until the spinach has wilted, 1 to 2 minutes more. Remove skin from the salmon, if desired, and serve topped with the sauce.