Stir together the Szechuan Sauce ingredients (leaving the cornstarch out)
Place green beans and scallions mix these together), mushrooms and salmon on a parchment-lined sheet pan. Spoon half of the Szechuan sauce over the salmon and veggies and toss the veggies in the sauce.
Place the sheet pan in the oven and bake, checking at 10-15 minutes ( depending on how thick your salmon is) give the veggies a toss, and checking the salmon. Continue baking until salmon is cooked through and broil if you want for the last couple minutes to give color.
In the meantime, heat up the remaining Szechuan sauce on the stove and whisk in a teaspoon of cornstarch to thicken. Pour this over the cooked salmon.
Sprinkle with toasted sesame seeds, and divide the veggies and salmon among two bowls.