Slice the zucchini and yellow squash a little thicker than 1/4 inch in thickness, each pepper into 6ths. Peel and core the pineapple, cut into 1/2 inch in thickness discs.
Take a large cookie sheet and cover it with plastic wrap (easy clean up later) and spread as much veggies as possible. Drizzle with oil. Use a basting brush to spread the oil, season with garlic powder and the Montana seasoning. Flip the veggies and repeat. Continue to oil and season all the veggies. Only oil the pineapple. Be sure to oil and season both sides of the veggies and pineapple.