Choose peaches that are fragrant and yield slightly to pressure, not rock-hard ones—they'll release more juice and create a richer, more flavorful filling during the slow cooking process.

Mix your cinnamon, nutmeg, and allspice directly into the brown sugar layer before adding peaches; this allows the spices to bloom and infuse evenly throughout the fruit as it cooks.

Keep your butter in the freezer until the last moment and cut it into small pea-sized pieces; this creates a crumbly, textured topping rather than a dense, oily layer.

Spread half the peach mixture on the crock pot bottom first, then add the oat topping, and finish with remaining peaches on top—this prevents the topping from absorbing too much liquid and staying crispy.

Transfer the finished cobbler to a preheated 400°F oven for 8-10 minutes in the last step to create a golden, crispy topping while keeping the peach filling warm and juicy.