Pour 3 cups of water in the pot of the Ninja Foodi and set aside.
In a large mixing bowl, add the cake mix, 1 cup water, oil, eggs, and poppy seeds. Mix until all ingredients are combined.
Pour into the prepared cake pan.
Place the cake pan on the lower part of the wire rack and place into the pot of the Ninja Foodi.
Set the Ninja Foodi on STEAM CRISP then move to STEAM BAKE.
Set to temperature of 280*F for 33 minutes.
Take the cake out of the Ninja Foodi.
Let it cool in the pan for 3-4 minutes.
Carefully remove the cake and set on a cooling rack, cool completely before frosting.
While the cake is cooling, in a large mixing bowl use a hand mixer and mix together the butter, powdered sugar, and poppy seeds.
Once the cake is cooled, frost with buttercream.
Serve.
Notes
If you do not have salted butter, use unsalted and add 1/8 tsp of salt.If you want to make this gluten-free, use a gluten-free yellow or white cake mix then add in a dash of lemon extract.The first three ingredients are making the cake mix, so your ingredients may differ if you use a different mix.