Preheat oven to 400 degrees.
Wash vegetables. Take broccoli and cut off the bottom ¼ inch of each stem, and then cut stem in half. Cut off the the stems on zucchini and squash, then slice.
Cover cookie sheet with foil. Arrange vegetables onto cookie sheet allowing space for each.
Drizzle olive oil ensuring vegetables are thoroughly coated. Squeeze lemon half over vegetables if desired making sure no seeds are expelled.
Sprinkle liberally with Jane's Krazy Mixed Up Salt or plain salt.
Place pan into oven for 4 minutes.
Turn pan around 180 degrees and cook for 4 additional minutes.
Remove from pan from oven and serve.