Heat 2 tablespoons oil in a saucepan over medium heat for 1-2 minutes until hot. Cut the green peppers and onions into strips and add to the saucepan.
Sprinkle the minced meat over the vegetables in small pieces. Season with salt and pepper. Stir everything together and cook over medium heat for 7-8 minutes, stirring occasionally, until the meat is cooked through and reaches 71 °C / 160 °F internally.
Add the canned tomatoes with their liquid and stir well. Cook over medium heat for 5 minutes. Then add the mushrooms and cook for another 2-3 minutes.
Remove from heat and stir in the sour cream. Taste and adjust seasonings with salt, pepper, and paprika powder as needed.