In a large skillet or pan, heat the olive oil over medium-high heat.
Add the chopped onion, zucchini strips, and bell pepper.
Sauté for 4–5 minutes, until the vegetables are tender-crisp.
Reduce the heat to low.
Stir in the dried oregano, ground cumin, drained black beans, and the can of green chilies.
Continue to cook, stirring occasionally, until everything is well combined and heated through.
To assemble, place 1/4 cup (960 ml) of cooked rice in the center of each warmed flour tortilla. Spoon an equal portion of the bean and vegetable mixture on top of the rice.
Fold the bottom edge of the tortilla up and over the filling, then tightly fold in the left and right sides.
Roll it up to seal.
Serve immediately or proceed to the next step for a crispy finish.
Optional: For a crispy burrito, preheat your oven to 350°F (175°C).
Place the wrapped burritos on a baking sheet and bake for 15 minutes, or until golden and crisp.
Add a sprinkle of shredded Monterey Jack or a cotija cheese inside the burrito before rolling for a cheesy upgrade.