This creamy mushroom, spinach, and pea sauce is the perfect hearty and umami accompaniment to salmon. You'll feel like you're making a fancy restaurant dish! Smarts: Instead of using cream, we combine chicken stock with arrowroot powder as a thickener to get that 'creamy' effect.
Heat oven to 400F (204C) degrees. Station sheet pan next to your stove.
Heat a non-stick frying pan, skillet, or saute pan over medium-high heat. Add first part of cooking oil and then fish fillets presentation-side (presentation side = non-skin side) down to the heated oil. Sear for ~3 minutes, until fish is golden.
Flip and transfer onto sheet pan and roast for 8 to 12 minutes, depending on thickness of the fish fillets, and desired done-ness. We like our salmon on the medium-side, with just a bit of translucence in the center still.
While salmon is cooking, add second part of oil to the same pan that you started the fish in. Next add in shallots and thyme. Saute for 1 to 2 minutes.
Add in mushrooms and cook until mushrooms have started to soften, ~3 minutes.
Give your sauce a stir and then pour it into the pan. Let it sit and wait for it to bubble and thicken. Toss so that it coats the mushrooms. Add in peas and cook until mushrooms are tender.
Fold in spinach leaves and remove from heat when leaves have wilted. Finish with chopped parsley (if using) and lemon juice and season to taste with salt and pepper.
Save half the fish for Thursday. Enjoy rest atop creamed mushroom, peas, and spinach. Serve with lemon wedges.