Preheat oven to 350°F.
In a large bowl, combine oats, flour, brown sugar, ground cinnamon, ground ginger, and sea salt.
Add your butter, cubed, to the oat and flour mixture and work into a sandy crumb texture.
Line a 9 x 9 square baking pan with parchment paper with an inch or two of overhang on each side.
Place your oat mixture in the pan and spread evenly over the bottom. Press down firmly.
Bake for 12-15 minutes until lightly golden brown. Let cool while you make the cheesecake filling.
In another large bowl, combine cream cheese with sugar and salt and beat on low in a stand mixer until fluffy (1-2 minutes).
Add your eggs, one at a time, and mix until it becomes a loose batter. Then, add your corn starch, lemon juice, lemon zest, fresh ginger, and light cream and mix for another minute.
Pass your cheesecake batter through a fine strainer onto the oat crust (don’t set the heavy strainer on top of the oats or you’ll rip the crust).
Cut rhubarb pieces in half down the middle to split each stock in two. Then trim them to fit in your pan (8-9") and place several pieces on top of your cheesecake batter.
Bake for 30 - 35 minutes, or until the cheesecake has a very slight wobble.
Remove from oven and let cool at room temperature for at least an hour. Refrigerate at least 4 hours or overnight.
Slice cheesecake bars into even pieces. Use a sawing motion to cut the rhubarb before pressing further into the cheesecake.