1) Prepare the pesto sauce by mincing all ingredients in a food processor
2) Remove the gills (i.e. black insides) from mushrooms. This step is very important, as it keeps the mushrooms from getting soggy
3) Mix breadcrumbs and pesto sauce
4) Spoon pesto mixture into each mushroom cap
5) Drizzle with olive oil, salt and pepper
6) Bake for 15-20 minutes at 400F
FYI: - Steps 1-2 can be done in advance
- These reheat very well
- I will sometimes bake with campari tomatoes (on the vine) to add colour
- I initially only made these with portobellos, but I find that the white mushrooms for stuffing are just as good and they are smaller and less expensive
- These can be made dairy with parmesan