Bake element will not shut off at set temp. - Whirlpool RBS275PD Electric Single Oven

You need to check the oven cycle relay,

1. Before repairs or testing can begin you must disconnect the electricity at the fuse panel, at the circuit breaker panel, or by pulling the plug. Make sure the power is off before proceeding. A jolt from 220 volts can be fatal, use caution!
2. In order to gain access to the oven cycling relay, refer to your owner's manual. Removing the back panel of the range accesses most relays, but some ranges locate the relay under the oven compartment where the utility drawer is usually located.
3. Now you can test the relay using your VOM. First, label each wire attached to the relay and remove them from the relay terminals. Using your VOM's ohmmeter function, set the range to R x 1 and touch one test lead to the terminal marked L and the other test lead to terminal H2. There should be NO continuity. Next, test the terminals marked H1 and H2. Again, there should be NO continuity. Finally, test the S and R terminals. Continuity should exist between these two terminals. If your relay does not pass all these tests, it is defective and should be replaced.
4. To remove the relay, undo the two screws securing it to the range and replace with the correct new relay. Refer to your wiring diagram and labeled wires to ensure that the wires are on the correct terminals. Now replace the back panel or drawer and test the oven.

Then you check the oven thermostat: When testing the thermostat switch contacts for continuity, refer to the wiring diagram and remove only those wires being tested - and only one pair at a time. Test switch contact terminals as per your wiring diagram. If the switch lacks continuity at any of the contact terminal points then the entire thermostat switch needs to be replaced. Adjusting the thermostat: Test the oven temperature by placing the tester in the oven's center and leaving it for 30 minutes at 350 degrees. Record the minimum and maximum temperatures of three cycles, then add those figures together, divide the result by six and you have the oven's average temperature.
If the average temperature is more than 25 degrees off, try calibrating the thermostat by following your appliance manual instructions for thermostat calibration.
Normally, thermostats are calibrated by pulling the oven's thermostat knob off, turning the knob over and adjusting the calibration ring on the back. If your oven doesn't have a calibration ring you may need to replace the thermostat.
To remove the thermostat: Disconnect the capillary tube and push it through the back oven wall, being careful not to break the flammable capillary tube wire. Remove the screws that secure the thermostat to the control panel and gently pull the thermostat out, leaving the wires in place. To install a new thermostat, reverse the disassembly procedures (Step 7 above), transferring the wires individually from the old unit to the new.
Hope this information helped you.