WET INGREDIENTS: In a small bowl, stir together the 1/2 cup + 1 tablespoon almond butter and 1/4 cup honey. Add the 1 teaspoon vanilla extract and 1/8 teaspoon fine sea salt. Stir until smooth.
OAT FLOUR: Add old fashioned oats to a blender or food processor. Pulse or blend until the oats resemble flour with no big chunks of oats. Remove from the blender and measure (measure AFTER being blended).
DRY INGREDIENTS: Add the 1/2 cup Rice Krispies cereal, 1/4 cup oat flour, and 1/2 cup old fashioned oats to the wet ingredients. Gently stir until combined and let stand to absorb the liquid and soften the oats for about 5-10 minutes. While it's sitting, begin prepping the fruit by washing and thoroughly drying(slice or chop as needed).
FINISH TART SHELLS: If the mixture is too wet, add in some more oat flour and if it's too dry, add a bit more almond butter or honey. Form balls with the dough, compressing the dough in your hand tightly. Once you have a ball shape, press your thumb in the middle of the ball and then gently form a tart shell by pinching the edges of the shell. Place shells on a plate or tray lined with parchment (they'll stick a little without the parchment paper).
FINISH: Fill tart shells up 3/4th full with vanilla flavored Greek yogurt or your preferred yogurt and then add berries or fresh fruit on top. If desired, drizzle a little extra honey, agave nectar, or pure maples syrup on top. Enjoy immediately.
STORAGE: These tart shells don't store well once filled with yogurt; the yogurt instantly begins to soften them. The tart shells store well without yogurt; keep them in an airtight container in the fridge. Unfilled shells will stay good for 5-7 days.