Pat fillets dry + season with salt/pep + half the seasoning blend; heat 1 tbsp oil in skillet over med-high; add fish to pan + sear 3-4 min undisturbed until fish naturally releases from pan; flip fish over + cook 3-4 min until fish is cooked through

Cut shallot in half; thinly slice each halves widthwise to make half moons; discard root

Wipe mushrooms clean + thinly slice; heat 1 tbsp oil in skillet over high, cook undisturbed 3 min; add shallot + sauté 3-4 min until browned + tender, season with salt/pep

Divide all to plates