Throw everything except the sour cream and cheese in a baking tray.
Place it into a 350°F / 180°C oven for 60 minutes.
Check if the vegetables and meat has the desired texture. Spread sour cream and sprinkle the cheese on top.
Change to oven to broil and place the tray back onto the oven's top rack until the cheese gets a nice golden brown color for about 10 minutes.
Advanced
Saute sliced onion and salt in the pan on high heat until it gets a glassy / translucent look for about 3-5 minutes.
Turn the heat down and occasionally stirring start caramelize the onion until it gets a golden brown color.
Stir a crushed clove of Garlic and cook it until fragrant.
Mix the ground meat with the onion and stir fry it until all the pinkish color is gone and starts to brown. This takes about 10 - 15 minutes.
Stir in the vegetables and stir-fry them for 5 minutes.
Pour everything from the pan into a baking tray. (In case of oven safe pans this step is optional)
Spread sour cream on top then sprinkle the cheese.
Change to oven to broil and place the tray back onto the oven's top rack until the cheese gets a nice golden brown color for about 10 minutes.
Overkill
Saute sliced onion and salt in the pan on high heat until it gets a glassy / translucent look for about 3-5 minutes
Turn the heat down and occasionally stirring start caramelize the onion until it gets a golden brown color.
Stir a crushed clove of Garlic and cook it until fragrant.
Mix the ground meat with the onion and stir fry it until all the pinkish color is gone and starts to brown. This takes about 10 - 15 minutes.
Cut up a cauliflower into pieces and slices then lay it on the bottom and sides of the baking tray. Also use the optional vegetables here.
Pour the stir-fried ground meat on top of the cauliflower bed.
Spread sour cream on top. If it seems too hard to pour add a bit of water but be careful as it gets runny quickly.
Optionally fill up some holes with the extra vegetables.
Sprinkle cheese on top. Place it into the oven on 350°F / 180°C oven.
When the vegetables get the desired texture and the cheese gets the golden brown color in about 30 - 40 minutes take it out of the oven and let it cool.