In a skillet cook your hamburger, onion, can of diced tomatoes, 2 T of beef bouillon and pepper to taste.
In a casserole dish, layer half of a hamburger bun. I split some in half to fit the edge of the pan.
Then spread half of your meat mixture on top. Sprinkle bacon that has been chopped up on top of that.
Layer some cheese slices.
Add some sliced pickles. And repeat the layers. We used two packages of buns for our family. Just smoosh down the layers to fit your pan. 
This is what it looked like before I baked it. 
I actually covered mine with plastic wrap and kept in the refrigerator for two days until I used it for a meal. Bake with foil on until heated 350 for 30-45 minutes.
Cut as you would lasagna to serve it. Tastes like cheeseburger sliders.
