If you want toast your pecans it will be important to go about doing it the right way so you can get it right. The first thing you will want to do is to preheat the oven to 350 degrees Fahrenheit. Once you have done that you will need to melt some butter in the microwave, making sure to use the proper type of container. After the butter has been melted you will need to evenly pour it over the pecans and spread them all out on a baking sheet, evenly distributing them so they will be able to cook properly.
Then you will need to put the sheet with the pecans into the oven and watch them as they begin to toast. Make sure that you toss the pecans a couple times while they are toasting so they are evenly toasted through on all sides. You will also need to make a point of keeping them in the oven until they are nice and crisp. Typically you will find that this takes around 10-15 minutes, though it varies depending on the oven you are using as well as the number of pecans on the sheet.