You need:
1 pack of microwave instant rice
1 can of tuna, in liquid or sauce of your choice
1 can of tomatoes, diced or crushed in can

To do:
Microwave rice as instructed, or to desired taste
Pour out heated rice into empty plate
Empty cans of tuna and tomatoes onto pile of rice
Stir in tuna and tomato into rice as desired
Place plate of mixture in microwave for 1-2 additional minutes

Notes:
You can substitute tuna and tomatoes for any canned variant of meat and vegetables. I prefer tuna and tomatoes for their price and low salt and fats (you can swap for sardines or salmon to reduce mercury intake, if you're worried about that). If desired, try substituting high salt or nitrite-rich canned foods with other options.
This meal takes advantage of the long shelf lives of canned food and instant rice to provide a quick, convenient and hearty meal, though may cause a small increase in microplastic consumption.

You need:
Sliced bread
Cheese, sliced, grated or in blocks
Paper towels
A toaster oven

To do:
Retrieve two or more slices of bread
Place cheese in between slices of bread, forming a typical cheese sandwich
Wrap sandwich in paper towel
Place on empty plate, then place plate in toaster oven
Set oven temperature to a maximum of 170C or 380F (Do not exceed 190C or 420F!)
Heat for 5-10 minutes, or longer if desired and attended to
Carefully remove from oven and unwrap for eating

Notes:
This method avoids cleaning needed with grilled cheeses made using skillets. You can simply dispose of the spent paper towel once finished.
It is important that the temperature maximum is not exceeded, to avoid spontaneous combustion of paper near 220C or 450F.
I haven't tried this, but you might be able to use an air fryer instead of a toaster oven.
You can also butter the slices before wrapping to impart additional flavoring after cooking.