Start by spreading the orzo evenly in a baking dish. Pour in the chicken stock and sprinkle half the kosher salt and black pepper. Make sure it is all well-distributed.
Place the salmon pieces right on top of the orzo mix, leaving some space between the pieces for even cooking.
Spoon chunks of Boursin over the salmon, making sure to nestle them well into the ingredients to encourage even melting.
Sprinkle the cherry tomatoes and baby spinach over the top, being careful not to overstuff to allow for even cooking.
Sprinkle the remaining salt over the entire dish and pop it in the oven at 375 degrees F for 35 minutes.
If you want a fresher texture, add the baby spinach during the last few minutes of baking.
Once your timer rings, check the salmon and orzo. If it’s still undercooked, pop it back in the oven for a few minutes, being careful not to dry out the salmon.