Preheat oven to 400 degrees. Grease and flour a 9 inch round baking pan.
Drain pineapple tidbits, reserving 2/3 cups of juice. Pat the tidbits dry with a paper towel.
In a medium bowl, mix brown sugar, cinnamon, pecans and cubed butter. Work the mixture between your fingers till well combined. Set aside.
In a large bowl beat the reserved juice with the egg, baking mix and white sugar. Beat together for 1 minute, just until you have a smooth batter.
Spread the batter into your prepared pan. Top the batter with half of the brown sugar/pecan mixture. Place the pineapple tidbits on top. Place the remaining brown sugar/pecan mixture over the tidbits. Bake at 400 degrees for 25 -30 minutes or until tests done with a toothpick.