Ingredients
Equipment
Method
- Set oven rack to the middle position and preheat to 325°F (160°C). Line a 9×13 inch (23×33cm) light-colored aluminum baking pan with parchment paper, leaving a 2-inch overhang on both long sides.
- In a stand mixer fitted with the paddle attachment, beat 170g softened unsalted butter and 150g granulated sugar on medium speed for 3 full minutes until pale and fluffy. Scrape bowl sides and bottom thoroughly.
- Add 1 room-temperature egg and 1 teaspoon pure vanilla extract. Beat on low for 30 seconds, then medium for 30 seconds until glossy and just combined.
- In a separate bowl, whisk together 270g all-purpose flour, ½ teaspoon baking powder, ½ teaspoon cream of tartar, and ¼ teaspoon fine sea salt. Add to the butter mixture in two additions on low speed, mixing only until no dry flour streaks remain — approximately 20 seconds per addition.
- Mix 2 tablespoons granulated sugar and 1 teaspoon ground cinnamon for the crust coating. Scatter half over the parchment-lined pan base. Press the crust dough into an even ½-inch layer across the pan. Scatter remaining cinnamon-sugar over the surface.
- Par-bake the crust at 325°F (160°C) for 12 to 14 minutes until just set and pale — not golden. Transfer pan to a wire cooling rack and cool for 10 full minutes. Mix 1 tablespoon granulated sugar and ½ teaspoon cinnamon for the crust-to-cheesecake interface. After the crust has cooled 10 minutes, scatter this evenly across the par-baked crust surface. Then pour the cheesecake filling over it and spread level with an offset spatula.
- In a large bowl, beat 454g full-fat block cream cheese alone with a hand mixer on low speed for 90 seconds until completely smooth with no lumps. Scrape bowl once during beating.
- Add 100g granulated sugar and beat on low for 60 seconds. Scrape bowl thoroughly. Add 2 room-temperature eggs one at a time, beating on low for 20 seconds after each addition and scraping between each. Add 1 teaspoon vanilla extract, ¼ teaspoon ground cinnamon, and 30g full-fat sour cream. Beat on low for 20 seconds until just combined.
- Pour cheesecake filling over the cooled crust and spread into an even layer with an offset spatula. Mix 2 tablespoons granulated sugar and 1½ teaspoons ground cinnamon for the interface layer and scatter evenly over the filling surface — do not press in.
- In a medium bowl, whisk together 90g all-purpose flour, 110g packed light brown sugar, and 1½ teaspoons ground cinnamon. Add 57g cold cubed unsalted butter and cut in with a pastry cutter or two forks until the mixture forms irregular clumps ranging from pea-sized to almond-sized. Scatter evenly over the cheesecake filling — do not press down.
- Bake at 325°F (160°C) for 30 to 35 minutes. Begin checking at 30 minutes. The bars are done when the streusel is deep mahogany brown, the cheesecake edges look matte and ivory, and the center wobbles as one unified mass when the pan is gently nudged. Do not open the oven before the 25-minute mark.
- Remove from oven and cool on a wire rack at room temperature for 60 full minutes. Cover loosely with plastic wrap and refrigerate for a minimum of 6 hours or overnight.
- To slice: lift the slab from the pan using the parchment overhang and place on a cutting board. Dip a sharp chef's knife in very hot water, wipe dry with a clean towel, and cut — repeating the dip-wipe-cut process for every single cut. Slice into a 3×4 grid for 12 bars.
Notes
- Cream cheese: full-fat block only — softened 2 hours at room temperature. No microwave. No tub or low-fat versions — filling will not set correctly.
- Butter (crust): must be softened to 65–68°F — too warm produces a greasy dough that does not hold its shape during par-bake.
- Crust interface layer: scatter 1 tbsp sugar + ½ tsp cinnamon over the warm par-baked crust before adding filling — creates the amber band visible in the cross-section.
- Butter (streusel): must be cold straight from the refrigerator — room-temperature butter produces paste instead of crumble clusters.
- Cream of tartar: do not substitute — it provides the snickerdoodle tang and controls the crust crumb structure.
- Cinnamon: check freshness before baking — smell should be strong and spicy. Stale cinnamon produces a flat, muted topping.
- Pan: light-colored aluminum 9×13 inch only. Dark pans overbrown the crust base. Glass pans require reducing oven temp by 25°F (15°C).
- Chilling: 6 hours minimum — overnight preferred. Bars cut before full chill will have a soft, collapsed center.
- Storage: lidded hard-sided container, refrigerated, up to 5 days. Do not use zip-lock bags — they compress and flatten the streusel.
- Freeze: wrap individually in plastic wrap, freeze up to 2 months. Thaw overnight in refrigerator — do not thaw at room temperature.
- Make ahead: bake the night before — cheesecake flavor deepens and slicing is cleaner after a full overnight chill.
- Scaling: do not scale up into a larger pan — use two separate 9×13 pans. Leavening in the crust does not scale linearly — use 1¾ times, not double.
- Altitude: above 3,500 feet, reduce baking powder to ¼ teaspoon and begin jiggle test at 26 minutes.
- Allergens: contains gluten, dairy, eggs.
- Tip: score the streusel surface along cutting lines before refrigerating — guides cleaner slices after the full chill.