A couple years ago Jessica Seinfeld was on Oprah talking about her book "Deceptively Delicious." I hung on every word she said because I loved how she snuck in things like pureed cauliflower (one of my faves) to mac 'n cheese. This is literally how I've always cooked. When I'm making a meal, I open my fridge to see what veggies are hanging around, then toss them in! It almost always works as long as you don't go crazy. My absolute blue ribbon tried and tested winner in the cookbook (yeah, i bought it the next day) is AVOCADO pudding. Trust me on this!
Melt 1/8 c butter in a pan
Stir in 1 pureed (or just mooshed) avacado, 1/2 c powdered sugar
Add 1/4 c cocoa powder & 1/2 tsp vanilla
Cook 3-4 minutes over med-low to thicken
Put mix in food processor or blender
Gradually stir in 1/8 c cornstarch