Wash and dry produce.

Trim and thinly slice scallions, separating whites from greens. Thinly slice mushrooms (skip if your mushrooms are pre-sliced!).

Heat a drizzle of oil in a medium pot over medium-high heat. Add scallion whites, mushrooms, and a pinch of salt and pepper. Cook, stirring occasionally, until veggies are slightly softened, 1-2 minutes.

Stir in 2½ cups water (5 cups for 4 servings), stock concentrate, and couscous. Cover and bring to a boil, then reduce heat to a low simmer. Cook until couscous and veggies are tender, 5-7 minutes.

Meanwhile, quarter lemon.

In a small bowl, combine half the cornstarch with 1 TBSP water (all the cornstarch and 2 TBSP water for 4 servings).

Once couscous and veggies are tender, add cream sauce base, Italian herb paste, spinach, and cornstarch mixture to pot. Stir to combine and cook, stirring occasionally, until thickened, 2-3 minutes more.

Divide chowder between bowls; top with croutons and scallion greens. Serve with a squeeze of lemon juice and remaining lemon wedges on the side.