Method1) Prep. Combine the butter, flour, brown sugar, granulated sugar, cinnamon, and salt in a small bowl. Blend the ingredients with a fork to create small crumbles.2) Cut the peaches in half vertically. Twist the halves and remove the pits. Cut approximately 1/8-inch off of the rounded side of each peach half so that the peaches can sit flat, pit side up, on the grill.3) Fire up. Prepare a grill for indirect cooking by placing a chimney full of pre-heated charcoal briquets on one side of the grill’s charcoal grate in order to create direct and indirect cooking zones. Add 2 to 3 chunks of your favorite smoking wood to the charcoal for flavor. Adjust the grill vents to bring the temperature to about 325°F. On a gas grill, adjust the temperature knobs so that one half of the grill is off and the other half is heated enough to maintain a temperature of approximately 325°F.4) Cook. Place the halved peaches, pit side down, on the hot side of the grill. Grill the peaches until lightly charred, approximately 3 to 4 minutes. Remove the peaches from the grill.5) Spread on the crumble. Top the pit side of the peaches generously with the crumble mixture, spreading the crumble all the way to the edges. Set the peaches, topping side up, on the cooler side of the grill as far from the heat source as possible. Cover the grill and allow the peaches to cook until the crumble mixture is golden brown, approximately 15 minutes.6) Serve. Plate the peaches and top with whipped cream. Serve immediately.