https://grannyshaffers.com/assets/newmenu.pdf
2 eggs, hashbrowns, two small (half size from the looks of the picture) pieces of bacon/sausage/ham and toast. Eggs are a dime a piece. Potatoes are <5 cents. Bread here is 4 cents/slice. A slice of ham shank at 89 cents/lb is 17 cents. Breakfast sausage links are 19 cents each (his menu doesn’t say how many sausages on a plate so going with one since he serves half slices of bacon). Bacon is $3.49 12 oz/pkg with about 13 slices so 27 cents/each. Those are grocery store prices from my receipts so are likely higher than what he pays.
Homecooked with would be in the neighborhood of 50 cents. That’s a savings of $6.89 not counting the savings on his $2.10 coffee, tax, tip and gas used driving there.
Last time our family of four went for breakfast, it was over $70. I haven’t had the desire to do it again after that. Besides breakfast is one of those meals that are often better at home.