1Heat oven to 400°F. Lightly spray 9-inch glass pie plate with cooking spray. In 10-inch skillet, heat oil over medium-high heat. Cook ham in oil 5 minutes, stirring occasionally, until browned. Stir in greens and onion. Cook 5 minutes longer until onion is tender and liquid is evaporated. Spoon half of the mixture into pie plate. Sprinkle with 3/4 cup of the cheese. Repeat layers.
2In medium bowl, stir milk, eggs, Bisquick mix and salt with fork or whisk until smooth. Pour over greens and cheese.
3Bake 25 to 35 minutes or until knife inserted in center comes out clean. Let stand 10 minutes before serving.