Prep the Peppers: Quarter the sweet peppers lengthwise, removing the stems, seeds, and white membranes.
Arrange them in a 2-quart square microwave-safe baking dish.
Add the water, cover the dish with parchment paper, and microwave on high for about 4 minutes, turning the dish once halfway through. The peppers should be crisp-tender. Carefully remove the peppers from the dish, drain any excess water, and set them aside.
Prepare the Filling: While the peppers cook, heat the pouch of Spanish-style rice in the microwave according to the package directions.
Drain the can of stewed tomatoes, making sure to reserve 2 tablespoons (30 ml / 1 fl oz) of the liquid.
Assemble and Layer: In the same baking dish, create your layers. Start with half of the pepper quarters, cut-sides facing up. Evenly spread the cooked rice over the peppers, followed by the drained stewed tomatoes.
Top with the slices of Monterey Jack cheese.
Finish by arranging the remaining pepper quarters on top, cut-sides facing down.
Microwave to Perfection: Drizzle the reserved 2 tablespoons (30 ml / 1 fl oz) of tomato liquid over the assembled peppers.
Cover again with parchment paper and microwave on high for 5 to 6 minutes, turning the dish once, until everything is hot and the cheese is beautifully melted.
Garnish and Serve: Let the dish stand for 5 minutes before serving. Just before you dig in, drizzle with olive oil, sprinkle with shaved Parmesan cheese, and garnish with fresh oregano sprigs if desired.