If you managed to get 1 egg...I'm assuming you probably did shoot the apple...shooting the apple reveals symbols to be entered in to make the boot come down so you can get the chicken to eat the food...thus giving you an egg.
There are 2 recipes that can be found, each one yielding an egg. There's the main recipe card above where the colored eggs sit, and next to the gun, which reads: 2-moons, 1-spade, 1-diamond. I'm guessing that's the one you've already used. The other recipie blends in with the wooden wall, next to a picture of a man with a BIG nose! If you can't find it...let me know and I'll tell you it here.
So, once you get both eggs, then you use the battery next to the apple to power the device that opens the locked door. Use the placement of all 4 eggs and match their surface colors in order......