Preheat your oven to 350 degrees F and heavily spray an 8-inch cake pan with nonstick spray. Set aside.
In a medium bowl, whisk together the flour, baking powder, salt and poppy seeds. Set aside.
In the bowl of your stand mixer with paddle attachment fixed, cream together the butter, brown sugar, and 1/2 cup of granulated sugar. Add each egg, one at a time. Make sure each egg is added fully before adding the next one. Add 1/4 cup of the orange juice and orange zest. Mix until just combined. With the mixer running on the lowest speed possible, add the dry ingredients to the wet. Mix, scraping down once or twice, until the ingredients are fully mixed.
Pour the cake batter into the prepared pan. The batter is going to be a little bit thicker than traditional. This is OK. Smooth out the top and place the cake in the oven. Bake the cake for 55 minutes to an hour or until a toothpick comes out clean and the top is very brown.
While the cake is baking, combine the remaining 1/2 cup of sugar, 1/4 cup of orange juice and confectioner's sugar in a medium bowl. Whisk until smooth.
While the cake is still hot, take a wooden skewer and poke the top so there are small holes everywhere. Pour the glaze evenly on top and smooth out with a rubber spatula if needed. Let the cake stand for 30 minutes before turning it out of the pan and cutting into pieces. Serve immediately or store for 24 hours. Enjoy!