Display screen or portion thereof with icon

FIG. 1 is a front view of a display screen or portion thereof with icon showing our new design;

FIG. 2 is a front view thereof, in which an oven in broken lines is provided to illustrate an example environment; and,

FIG. 3 is another front view thereof, in which a display screen in broken lines is provided to illustrate an example environment.

The long dash short dash broken line in FIGS. 1 and 2 represent the bounds of the claimed design and form no part thereof.

The broken lines showing of the oven in FIG. 2 are included for the purpose of illustrating environmental structure and form no part of the claimed design.

The broken lines showing portions of the display screen and of the icons and text in FIG. 3 are included for the purpose of illustrating portions of the article and form no part of the claimed design.