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1
In a large bowl, mix flour, sugar and salt; cut in butter until crumbly. Stir in oats. Gradually add ice water, tossing with a fork until dough holds together when pressed. Shape into a disk; cover and refrigerate for 1 hour or overnight.
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2
On a lightly floured surface, roll dough to a 13-in. circle. Transfer to a parchment-lined 14-in. pizza pan. Refrigerate, covered, while preparing filling.
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3
For filling, cut a thin slice from the top and bottom of oranges; stand oranges upright on a cutting board. With a knife, cut peel and outer membrane from oranges. Cut along the membrane of each segment to remove fruit from 8 oranges. Thinly slice remaining 2 oranges; remove seeds. Place orange segments and slices between layers of paper towels to remove excess moisture; let stand while preparing filling.
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4
In a small bowl, beat goat cheese, cream cheese, sour cream, honey, 1 egg yolk and salt until smooth. Spread over crust to within 2 in. of edge. Arrange orange segments over cheese mixture. Sprinkle with 2 tablespoons coarse sugar; dot with butter.
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5
Fold crust edge over filling, pleating as you go and leaving an opening in the center. Whisk remaining egg yolk and water; brush over folded crust. Arrange orange slices over crust to within 1 in. of edge. Sprinkle with remaining coarse sugar. Freeze, covered, overnight.
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6
Preheat oven to 375u00b0. Bake until crust is golden and filling is bubbly, 60-70 minutes. Transfer tart to a wire rack to cool.
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7
For sauce, in a small saucepan, melt butter over medium heat. Add brown sugar, cream, honey and cinnamon; bring to a boil. Boil 1 minute, stirring constantly to dissolve sugar. Serve with galette.
