Combine all ingredients (except for sprinkles) in the order listed into a large mixing bowl.
Whisk until smooth, adding 3/4 cup sprinkles at the very end of mixing.
Let batter rest for 5 minutes.
Preheat your waffle maker.
Once waffle maker is preheated, add about about 1 and 3/4 cup batter to the center of the waffle maker for a four-waffle maker. (If your waffle maker makes one waffle at a time, add a little less than half a cup to the middle of your grid.)
Spread the batter as evenly as possible, covering all squares of the grids with a silicon or heat-proof spatula.
Close lid and heat until waffle maker finishes the cooking cycle.
Carefully remove hot waffles, careful not to rip them.
Repeat the cooking process with remaining batter. (You may keep the cooked waffles on a metal pan in warm oven while the rest cook.)
Garnish with syrup, whipped cream, and the remaining 1/4 cup of sprinkles. Add birthday candles, if desired.