The biggest thing is heat oil with a couple kernels. Once they pop, pour in the rest. Then remove pot from heat and stir around for about 30 sec. Then return to heat. Pops perfect every time.
If adding butter, cook it separately med-high until it no longer bubbles and then immediately apply and then it won't shrivel the popcorns.
Not much in 5e. Maybe cr 3 for the whole thing. A party of lvl 1 could do it assuming they don't roll bad on saving throws for the traps. The wasp and glass part seems most dangeous. If party is likely to just bum rush it, maybe cr4 and a party of level 2
The biggest thing is heat oil with a couple kernels. Once they pop, pour in the rest. Then remove pot from heat and stir around for about 30 sec. Then return to heat. Pops perfect every time.
If adding butter, cook it separately med-high until it no longer bubbles and then immediately apply and then it won't shrivel the popcorns.