The phrase means using a small electronic kitchen tool called a hand mixer to blend or mix ingredients in a big container called a large bowl. Full definition
Add the lard to the workbowl of a standing mixer fixed with the whisk attachment (or use a regular hand mixer in a large bowl) and beat it together with the salt and baking powder until light and fluffy. (fieryfoodscentral.com)
In the bowl of a stand mixer fitted with a whisk attachment [or an electric hand mixer in a large bowl], whip together the egg whites, along with the cream of tartar until soft peaks form, about 5 to 7 minutes. (darciebakes.com)
Add the lard or butter to the workbowl of a standing mixer fixed with the whisk attachment (or use a regular hand mixer in a large bowl) and beat it together with the salt until light and fluffy. (fieryfoodscentral.com)