In a large mixing bowl, cream together butter, brown sugar and granulated sugar. Add eggs, vanilla extract, salt, cinnamon, nutmeg, ginger and mix until smooth. Add flour and mix everything. It's so much easier to use your hands to form the dough.
If dough looks a little dry and crumbly, add milk (1 tablespoon at a time) until you have thick cookie dough that's NOT sticky! Keep aside.
Cover a dome pan (Diameter: 6 inches) with aluminum foil and spray it generously with oil.
Scoop out a big portion of the dough and roll it into a rough ball and place it on top of the dome and use both your hands to spread it all over the pan as smooth as possible. The more smooth it is, the less cracks there will be.
Cut off excess dough along the bottom of the pan with a knife or pizza cutter. Place this prepared dome pan on a cookie tray, lined with parchment paper (or foil paper that's lightly sprayed with oil). This will prevent the bowl from sticking to the pan. Chill in the freezer for 25 minutes.
Bake at 350 degrees for about 25 minutes or until cookie bowl becomes golden brown.
Allow the bowl to cool down completely.
Remove the dome pan and foil paper carefully. Place the edible bowl on a cookie tray lined with wax paper.
Brush melted semisweet chocolate on the exterior of the cookie bowl only. Make sure you paint chocolate in one direction for a neat and clean appearance.
If you are decorating with sprinkles or crushed candy canes, toss those on the melted chocolate now before the chocolate sets and hardens. If you are doing piped decorations, continue with the next few steps.
Chill in the fridge until chocolate sets.
Remove excess chocolate from the base of the bowl, using a knife.
Fill a piping bag with melted white chocolate and pipe designs on the edible bowl.
Allow the white chocolate to set and harden at room temperature.
Flip over the bowl and place it on a small plate or saucer. You can stick it in place with melted chocolate, if you like.
Fill the bowl with an assortment of cookies and enjoy!