Preheat oven to 350F. In large skillet, heat oil over low fat. Add onion, garlic and bell pepper. Cook, stirring often, until onion is softened, about 3 min. Sprinkle vegetable mixture with flour. Cook, stirring, 1 min. Remove skillet from heat. Whisk in milk, a little at a time. Return skillet to medium-low heat, stirring until sauce thickens. Remove from heat; add spinach. Cool mixture slightly; stir in herb mix and egg substitute. Pour mixture into pasta crust and sprinkle top with cheese.
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