1Heat oven to 350ºF. Grease 9-inch pie plate with shortening. In 12-inch skillet, melt butter over medium heat. Add spinach and bell pepper; cook about 5 minutes, stirring occasionally, until spinach is wilted and bell pepper is crisp-tender.
2In small bowl, beat remaining ingredients except cheese with wire whisk until smooth. Pour over vegetables in skillet; stir to mix. Pour into pie plate.
3Bake uncovered about 30 minutes or until center is set. Sprinkle with cheese. Serve immediately.