In a nonstick skillet, heat EVOO over medium. In a bowl, whisk egg, 1 tbsp. cold water and a pinch salt. Add to skillet. Cook egg, covered, until set, 2 minutes. Sprinkle tortilla with cheese, then top with egg, steak and thyme. Fold in half. Lightly coat the same skillet with cooking spray. Cook quesadilla over medium-high until browned, about 2 minutes per side. Cut into wedges.