BAD IDEA
Can I bake a cake in the sun?
Yes, if you have all day and patience of a saint — otherwise, just use the oven.
Baking a cake by just leaving the batter in the sun is theoretically possible but practically ridiculous. It’s not about the heat alone; baking requires consistent, controlled temperatures way hotter than the sun-warmed environment you get outdoors. Your cake would probably turn into a gooey mess or an overcooked crust with raw middle. Use an oven instead, unless you’re training for a slow baking endurance test.