In a deep saucepan, sauté the onions in cooking oil over low heat for 5 minutes. Stir occasionally.
Add chopped potatoes, zucchini, and bell peppers to the saucepan.
Incorporate chopped garlic, sautéed onions, canned tomatoes, salt, and spices into the mix.
Thoroughly mix all ingredients. You can optionally add 4-5 tablespoons of water, but it’s important to note that the vegetables will release enough liquid, and it will blend with the juice from the canned tomatoes.
Cook the vegetables for 20 minutes, stirring occasionally.