You're probably referring to this sign
I'd agree with Laurel in the answer already given that "all the trimmings" will be recognised in American English.
An alternative expression would be "all the fixings" or "all the fixin's"
A Google NGRAM search of the corpus of American English returned the following results
The Online Etymology Dictionary says fixing is a
verbal noun from fix (v.). American English sense of "food, garnishing" is attested from 1839.
The Cracker Barrel, a US restaurant chain offers a Wholesome Fixin's menu
Now hungry restaurant-goers looking for their homestyle favorites at Cracker Barrel Old Country Store® can find them plus a whole lot more. The new Wholesome Fixin’s menu category features 11 low calorie, better-for-you choices, with fresh ingredients and full-bodied flavor
TFD's definition for with all the fixin's (fixings) is:
Rur. with all the condiments or other dishes that accompany a certain kind of food.
I guess the "Rur." means that it's a rural expression? Probably used mainly in the South.
When you scroll down, you'll see that TFD also has a references in periodicals archive where you can find actual examples of usage such as:
Not so influenced by pop culture as the postmodernists, the stories in Drinking Coffee Elsewhere entertain on a familiar, almost nostalgic level--like Sunday dinner with all the fixin's at grandma's house.
TFD's definition for "with all the trimmings" is
with all the extra things, especially with food.
Their references in periodicals archive for with all the trimmings returns results with UK and US English examples:
Offering up turkey with all the trimmings, plus the bonus of a Yorkshire pud, owners Les and Pam Hippolite charge just pounds 3.
Turkey with all the trimmings and extra courses available including mince pies.
Company Enables One Lucky San Francisco Bay Area Family to Get the Ultimate Thanksgiving Feast with All the Trimmings
Cost Plus World Market (NASDAQ:CPWM), a leading retailer of casual home living and entertaining products, unveils a hassle-free Thanksgiving sweepstakes where one San Francisco Bay Area winner will enjoy the ultimate meal with all the trimmings.