For the crust, in a food processor combine flour and baking powder, pulse a few times. then cut the half of butter stick into 4 pieces and process for a few seconds. When there are no large pieces, add the milk and process until smooth, paste like.
Cook the chicken with the seasonings, when it is almost cooked through, add the chicken broth and peas, turn heat to low, cook for another few minutes.Preheat oven to 350.
In a 6 deep muffin pan (or you could use a regular 12 muffin pan, they would just be smaller) spray with cooking spray, then add about 1 heaping spoon full of the dough mixture to the bottom of each cup and spread around the bottom, then on top of that divide the chicken/pea/carrot/broth mixture (I had a little broth left over at the bottom of the pan and spooned it evenly ontop of the chicken mixture. Then add shredded cheddar, and then top off each one with a remaining dough and spread around. Bake for 35 min, let cool for 5, and viola, you're done!