is it, but perhaps it can help you with the ratio of ingredients! Hope it helps!
Ingredients:
1/4 C. plus 2 Tbsp. Butter, divided
3 medium sized Onions, peeled and chopped
2 C. Grated Swiss Cheese, divided
1 C. crushed Saltine Crackers, divided
2 Eggs
1/4 C. canned Evaporated Milk
1 tsp. Salt
1/2 tsp. Pepper


Preparation Instructions:
Melt 1/4 cup butter in large skillet over medium heat. When hot, add onions and
sauté until tender. Place half of onions in a 1 1/2 qt. deep dish pie pan.
Sprinkle 1 cup Swiss cheese and 1/2 cup cracker crumbs over onions. Repeat
layers of onions and cheese. In a medium sized bow, beat eggs, milk, salt and
pepper. Pout evenly over onion mixture. Melt 2 tablespoons butter in skillet
over medium -high heat; stir in remaining cracker crumbs. Lightly brown, then
sprinkle crumbs over casserole. Bake 25 minutes at 350 degrees. Good with beef
or Ham.

From Generations Family Cookbook