To toast a bagel in an oven, you typically want to use a high temperature to achieve a crispy outer texture while keeping the inside soft. I recommend setting your oven to 375°F (190°C) for toasting bagels. Depending on your oven and personal preference, you may need to adjust the temperature slightly higher or lower.
Keep in mind that the toasting time can vary based on the thickness of the bagel and how crispy you want it to be. Generally, it takes about 5-7 minutes to toast a bagel in a preheated oven. However, you should keep an eye on it and check regularly to avoid over-toasting or burning.
Remember to slice the bagel in half before placing it in the oven, and you can lightly brush the cut sides with melted butter or oil for extra flavor, if desired.