Homemade White castle

Here in California we can only get White castle in the freezer alse. So after searching the internet and tring a couple different ones this is what I came up with.

Ingredients:
1/2 cup dried onion flakes*
2 pounds ground chuck- 80/20 ground beef
1/2 t. seasoned salt*
6 slices cheddar cheese or american cheese slices
12- small party rolls**

*you can use onion soup mix instead
**you can use Hawaiian sweet rolls 

Directions:
Evenly spread the onions on the bottom of a 9x13 inch baking dish. Gently press the ground beef on top of the onion flakes. Press evenly making one giant patty.
Sprinkle with seasoned salt. At this point you can use a drinking straw and poke holes throughout the meat. That is what they do with the original white castle sliders.
Bake in a 400 degree oven for 20 minutes. Using a paper towel, pat the excess grease from the top of the patty.
Top with cheddar cheese, return to oven for 2 more minutes.  Remove from oven, let set 5 minutes then cut into patties.
Slice open and separate each party roll. Place bottom of rolls on a large platter. Using a spatula lift pattie with onion layer onto each bun bottom.
 Top each slider with a pickle slice then the bun lid. Serve immediately. Makes 12- 15 sliders depending on how big you cut them.