Heat your oven to 325 degrees.
Grease and flour or grease and line 2 9-inch cake pans.
Mix the first 4 ingredients: cake mix, sugar, flour, and salt.
Add the remaining ingredients and mix on low speed for several minutes (with either a stand mixer or a handheld electric mixer) until combined. There will be some lumps.
Divide the batter into the two prepared pans.
Bake until done (about 35 minutes).