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PdfPreheat oven to 350°. Line a 9-inch-square metal baking pan with parchment paper, leaving a few inches of overhang on 2 opposite sides.
Beat flour, oats, brown sugar, baking powder, lemon zest, cinnamon and salt in a large bowl with a mixer on medium speed until combined, about 20 seconds. Beat in vanilla. With mixer on low speed, add butter, 1 piece at a time. Let mixer run until butter is broken down into smaller, flour-coated pieces about the size of a pea, about 1 minute. (Mixture should be crumbly.)
Press about two-thirds (about 3½ cups) of crumb mixture into baking pan. Using the flat bottom of a metal measuring cup, tightly pack down crumb mixture to form a crust.
Bake crust in oven for 10 minutes. Remove from oven, and spread jam over crust. Arrange sliced strawberries in a single layer over jam. Sprinkle remaining crumb mixture over top, using a spatula to lightly press down.