If you've dreamed of a day in which Egg McMuffins could be purchased way after the weekday 10:30 a.m. cut-off, you may be in luck: McDonald's plans to test all-day breakfast in the coming months, CNBC reports. "Our industry sources inform us that McDonald's US plans to test all-day breakfast -- breakfast items for sale throughout the 24-hour day -- in one domestic market, with the test set to begin within the next month or two," Janney Capital Markets revealed in a note on Monday.