Heat 2 teaspoons of olive oil in a small skillet over medium heat. Add the washed asparagus to the skillet and cook, stirring occasionally, for 4-5 minutes.
While the asparagus is cooking, add the remaining tablespoon of olive oil, lemon juice, Dijon mustard, and minced garlic together in a small bowl; whisk until well combined. Once the asparagus is crisp-tender, add the lemon mixture to the skillet and cook, stirring constantly, for 1 minute. Season with sea salt and freshly cracked pepper, to taste. Place the asparagus spears on a serving plate then top with crumbled feta cheese. Serve immediately. Enjoy.