• Preheat oven to 425°F.
• Lightly coat 3-quart ovenproof pan with cooking spray.
• In bowl, whisk together egg, milk, and flour. Pour into prepared pan.
• In medium bowl, toss apple slices with brown sugar and thyme leaves.
• Gently place tossed apple slices into pan with eggs.
• Bake until frittata is puffed, golden brown, and set in center, 8 to 10 minutes.
• Remove from oven and let rest 5 minutes. Cut into wedges to serve.
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