Heat olive oil in a large skillet over medium-high heat for 1 minute.

Add chicken and sprinkle evenly with paprika.

Cook chicken for 3 to 5 minutes, or until lightly browned.

Add chopped onions and cook until crisp-tender, about 5 minutes, stirring frequently.

Sprinkle with flour, salt, and pepper.

Stir in diced tomatoes with their liquid.

Bring to a boil over high heat, stirring constantly.

Reduce heat to low and simmer, partially covered, for 10 minutes, or until chicken is tender.

Remove skillet from heat and take off the lid.

Stir in sour cream.

Serve hot with dumplings, mashed potatoes, or rice, if desired.