Spread a kitchen towel on the counter. Use your jar lifter to remove a jar from canner, drain, and place on the towel. Keep the remaining jars in the canner so they stay hot.
Fill the jar with roasted peppers, leaving a 1/2-inch headspace. Give your marinating brine a good stir to be sure the oil is evenly distributed. Use your canning funnel and ladle to fill the jar about halfway with the brine.
Run your bubble popper through the jar to mix the peppers with the brine, and top off with more brine leaving a 1/2-inch headspace. Run the bubble popper through the jars again to remove air bubbles.
Wipe the rim with a damp towel to remove residue. Center a lid on the jar, place the band over the lid, and screw it on until fingertip tight. Place the jar back into the canner, and repeat with the rest of the jars.
Once jars are all in canner, adjust the water level so it is 2-inches over the tops of the jars.
Cover the canner and bring the water to a rolling boil over medium-high heat. Once the water is boiling, process both half-pints and pints for 15 minutes at altitudes of less than 1,000 ft. Adjust processing time for your altitude if necessary (See Notes below).
When processing time is complete, turn off heat, remove the cover by tilting lid away from you so that steam does not burn your face, and allow the canner to cool down and settle for 5 minutes.
Spread a kitchen towel on the counter. Use a jar lifter to remove the jars one at a time from the canner. Keep the jars upright, and place them on the towel. Do not tighten ring bands or test the seals yet. Let the jars sit undisturbed for 12 to 24-hours to cool.
After the jars have cooled for at least 12 hours, check to be sure lids have sealed by pushing on the center of the lid. The lid should not pop up. If the lid flexes up and down, it did not seal. Refrigerate the jar and use within 2 weeks.
Remove the screw on bands and wash the jars. Label, date, and store the jars of marinated red bell peppers in a cool, dark location between 50 to 70 degrees F for 12 to 18 months.
For best flavor, let the jars sit for at least 4 weeks before opening to allow the flavors to develop. Refrigerate after opening and use up within 2 weeks. Yields about 8 half-pint or 4 pints.