Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
Trim the woody ends off the asparagus and toss the spears with 0.5 tsp of olive oil and a pinch of sea salt.
Roast the asparagus for 12 minutes until tender and slightly charred.
Bring a pot of salted water to a boil and cook the whole wheat spaghetti according to package directions until al dente.
Season the chicken breast with sea salt and black pepper, then pan-sear in a skillet with the remaining 0.5 tsp of olive oil over medium-high heat until cooked through, about 5-6 minutes per side.
While the chicken rests, whisk together the Greek yogurt, minced garlic, lemon juice, and lemon zest in a small bowl until smooth.
Slice the chicken into thin strips.
Drain the pasta, reserving 1 tablespoon of pasta water, and return it to the pot.
Toss the pasta with the yogurt sauce, reserved water, sliced chicken, and roasted asparagus.
Garnish with freshly chopped parsley and serve immediately.