Saute olive oil and garlic for 5 minutes on low/med heat (until garlic is light brown)
Add chopped peppers and onion, cover and cook on low for about 5-10 minutes stirring occasionally
Add mushrooms, canned tomatoes and kale/spinach, stir and cover on low/med heat for 5 minutes
Add Cod Fillet on top of all the vegetables, season and cover
Bring to a boil. Once boiling, turn down to low (#2 or low on your oven) and simmer on low (will still be boiling) for about 10 minutes.
Cod is done when it is flakey and starts splitting apart
*season to taste