Toast 2 slices bread in toaster oven or pan until deeply browned, but not burnt.
In a sauce pot (ideally at least 3 quarts/3.5 L) combine toasted bread, 4 salted egg yolks, 2 fresh egg yolks, 150 g sugar, 30 g skim milk powder, 450 mL heavy cream, and 250 mL whole milk. Cook over medium heat, stirring frequently, until mixture reaches 180F. Remove from heat, cover and steep for 1 hour. Pass through a fine mesh strainer to remove the toast.
Prepare an ice bath by filling a large container with equal parts ice and water with enough room to place a container containing the ice cream base inside. Pour the ice cream base into a large container set over an ice bath. Chill the mixture until very cold (below 40°F) adding more ice and stirring as needed.
Pour the ice cream base into an ice cream machine and spin according to machine directions. The resulting ice cream should be a smooth, soft-serve consistency. Transfer the ice cream to a storage container and freeze for at least 3 hours to fully firm up.