Here are your parts
Parts for Whirlpool RBD305PRB00 Wall Oven - AppliancePartsPros.com
See the attachment for the tech sheet.
Odds are you blew the thermal overload (item 37 in the Upper Oven Parts section).
Would not hurt to also check your oven sensor, see the belo link and items 7, 8, 20 and 21.