1.Spread 1/4-Inch Of Nut Butter Or Dijon Mustard On The Underside Of Each Portobello Cap. 2.Layer Vegetables And Bacon On 2 Of The Portobello Caps. 3.Top The Sandwiches With Remaining Portobello Caps. 4.Optional: For A Toasty Meal, Coat The Top Of Each Sandwich With Coconut Oil And Broil For A Minute Or Two.