Cheeseburger Casserole (with faux meatballs)

Who doesn't love a good cheeseburger- especially in the summertime! (off the grill)
Ever had a the major things that go into a cheeseburger- as a casserole?\No? Try it?
There are version of cheeseburger casserole out there, but they seem more like hamburger helper type recipes. This is a bit different. Well, of course it is! It is a recipe coming from me! 

INGREDIENTS:

• rye bread - 3 pieces broken to fit round pan
• eggs - 2
• avocado mayo - 1/2-1 cup for egg mixture & 1/2 cup for layer
• mustard - 1/2 cup for egg mixture & 1/2 cup for layer   (I used yellow)
• Spices: pepper, garlic, onion powder, thyme, mustard powder - 1/2 to 1 tbsp (all-depending) - used with egg mixture
• loosely chopped ( or mashed) cooked meatless meatballs    (or meat)
• sauteed onions - 1-1 1/2 onion (I used both red & yellow)
• shredded cheddar - 1 bag  (used in the layer and topping)
• lettuce - 1 cup
• tomatoes - chopped (I used roma)
• ketchup - 1/2  cup for layer
• breadcrumbs - 3/4 cup 
• EVOO - for sauteing onions, cooking the meatless balls, and to lightly sprinkle on top of crumbs
• sesame seeds - sprinkle on top    (optional)
• parsley - sprinkle on top     (optional)

Preheat oven to 425. Spray pan with non-stick. Spray bread and dash some spices on both sides- then place at bottom. Mix eggs, spices, avo-mayo, mustard and spread on top of bread (mash a bit with fork). Start your layers! I did mine like a burger! Meatless balls -> onions -> cheddar -> tomatoes -> lettuce -> mayo, mustard, ketchup -> breadcrumbs -> EVOO -> cheddar -> sesame seeds -> parsley.
Place in over (uncovered) and bake for 25-30 minutes. Take out of oven and let sit before serving. Like any types of layer baked dish- give it time! 
Serve and enjoy!

Afterthought: Maybe add a bit more avomayo, mustard, ketchup - to have a bit more distinctive taste of those 3 things.
FYI: If you want to have a light brown baked dish, bake at 425 for 30 minutes. If not, bake a 400 for 25 minutes.