Grease and flour 13x9-inch pan or spray with nonstick cooking spray. Set aside
Heat butter and white chocolate chips in a large pot over low heat, just until melted. You can also melt it in a large bowl in the microwave. Either way stir it often - mixture may appear curdled when it's done.
Remove from heat and let cool.
Stir in remaining brownie ingredients until well blended.
Pour batter in pan and use an offset spatula or knife to spread evenly.
Bake 30 to 35 minutes in the preheated oven - until toothpick inserted in center comes out clean or the brownies register between 165° and 210° on an instant read thermometer. The lower temperature will result in very chewy brownies and the higher temperature in a more cakey brownie.
Cool completely.
Frosting
Mix all glaze ingredients in a medium bowl until smooth and spreadable.
Spread glaze over brownies with a knife or a small offset spatula.
Christmas Trees
Cut the vanilla brownies horizontally in 3 parts.
Cut slanted lines to create triangle "Christmas trees". See image in post above.
Decorate with sprinkles as desired.
Notes
Expert Tip: White vanilla baking chips burn easily. Be sure to melt them over low heat and stir often. You can also melt them at 50% power in the microwave, stirring every 30 seconds.
White chocolate chips or vanilla baking chips as they are sometimes called, are not the same as the candy coating (candy melts). Be sure to use white chocolate.
For chewy brownies remove the pan from the oven when the brownies register 165° to 185° with an instant read thermometer.
For cakey brownies the temperature should be between 190° and 210°.
If the white chocolate clumps up and turns hard while you are melting it you'll have to start over with new chocolate. Be careful that the pan or bowl is completely dry and everything is done on a low temperature.
Toasting the pecans will give them more buttery flavor.