Who at Pillsbury invented toaster strudels?
The toaster was invented before World War I, which lasted from 1914 to 1918. An electric toaster was invented in 1893, but it was not commercially successful. A successful electric toaster was invented in 1909, also before WWI. But the pop-up toaster was not invented until after WWI, in 1921. So it is likely that refinements of the toaster invention were continuing during the war.
As a by product of the electric stove the first electric toaster oven was invented in 1910. A gentleman named William Hadawy who designed the first electric stove also invented the toaster. William developed the idea for the Westinghouse Corporation who is still a leading producer of toaster ovens today.