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1. Preheat the oven to 450u00b0F.
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2. Toss the asparagus with 1 tablespoon of the olive oil, 1 teaspoon of the salt, and 1/4 teaspoon of the pepper in a large mixing bowl. Stir in the garlic. Spread out the asparagus on a baking sheet.
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3. In the same mixing bowl, toss the leeks with 2 tablespoons of the olive oil, 1 teaspoon of the salt, and 1/2 teaspoon of the pepper. Spread out the leeks on a separate baking sheet.
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4. Put both baking sheets in the oven and roast the asparagus and leeks for 5 minutes. Remove the vegetables from the oven, turn once, and return to the oven for another 5 minutes, or until nicely browned. Remove from the oven and let cool for 5 minutes on the baking sheets.
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5. Reduce the oven temperature to 350u00b0F.
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6. Chop the asparagus and leeks into 1-inch pieces.
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7. Heat the remaining 1 tablespoon olive oil in a 10-inch ovenproof nonstick skillet over medium heat. Add the asparagus, leeks, and red onion and cook for 2 minutes.
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8. Using a whisk or a fork, beat the eggs and cream with the remaining 1/2 teaspoon salt and the remaining 1/4 teaspoon pepper in a bowl until frothy. Pour the egg mixture over the asparagus and leeks.
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9. Bake the frittata for 10 to 12 minutes, or until it is nicely set but not overly firm. Allow the frittata to stand for 5 minutes. Cut into wedges and serve.
