- Preheat oven to 350°F.
- In large bowl, heat cake mix, margarine and 1 egg with mixer until crumbly.
- Stir in saltine crumbs.
- Reserving 2 cups of crumb mixture, press remaining crumbs into bottom of greased 13x9 baking pan.
- Bake 20 minutes.
- With mixer or wire whisk, beat 3 egg yolks, sweetened condensed milk and lemon juice. Spread over prepared crust. Top with reserved crumb mixture. Bake 25 minutes or until set. Cool.
- Cut into bars. Store covered in refrigerator.