Paprikas Waban Style

I have just completed my second attempt at chicken paprikas and have revised the recipe thus:

1 onion
1/2 large red pepper
1 large carrot
3 large chicken breasts (1.8 pounds)
half a can of diced tomatoes (7 ounces, drained of liquid)
1 teaspoon sweet paprika
20 minute simmer
add thickener, strained
1 teaspoon salt