For couscous, prepare according to package directions.
While water is boiling for the couscous, heat a large skillet (12+ inch) over medium high heat. For zucchini, cut into large diagonal slices and then cut into halves or thirds, like a large julienne cut. Add 1 tablespoon olive oil to hot pan. Toss in zucchini slices and shake to coat with oil. Sprinkle with salt (I'd recommend Aldi garlic salt) and pepper.
While zucchini is browning, dice the tomato, thinly slice the spinach, and chop the cilantro.
Once zucchini starts to brown (7-8 minutes), push to the side of your large skillet. Rinse and pat salmon dry with paper towel. Season both sides with salt (again, garlic salt if you have it) and pepper. Leave skin on (it gets very tasty, I promise). Add another tablespoon of olive oil to the empty side. Place salmon skin side up in pan. Cook salmon skin side up for about 3 minutes depending on the thickness of your filets, until golden brown crust forms. Flip and cook for another three minutes skin side down. Remove from heat but leave in the pan for a few minutes to finish cooking (2-3 minutes)
While the salmon is cooking, add chopped tomato, spinach, cilantro, and feta to your prepared couscous. If desired, add 1 teaspoon of olive oil and season veggies with garlic salt and pepper before mixing. Replace cover on couscous until ready to plate.