A microwave heating construct (1400; 1500) comprising: a dimensionally stable base (1418a; 1518a) having a first side and a second side opposite the first side, the base including a plurality of corrugations (1422a; 1522a); a first susceptor layer (1402a; 1502a) joined to the base, the first susceptor layer (1402a; 1502a) is disposed on the first side of the base (1418a; 1518b), the first susceptor layer having a substantially planar configuration, so that the first susceptor layer extends across the plurality of corrugations; and a second susceptor layer (1402b; 1502b) joined to the base, the second susceptor layer (1402b; 1502b) is disposed on the second side of the base (1418a; 1518b), the second susceptor layer having a substantially planar configuration, so that the second susceptor layer extends across the plurality of corrugations, wherein the construct including the first susceptor layer and the second susceptor layer is for underlying a food item having a lower surface that is desirably at least one of browned and crisped, wherein at least one of the first susceptor layer and the second susceptor layer includes a central region including a microwave energy transparent area (1404; 1504) circumscribed by the respective susceptor layer, at least one of the first susceptor layer and the second susceptor layer includes a peripheral region extending around the central region, the peripheral region including a microwave energy transparent area circumscribed by the respective susceptor layer. a dimensionally stable base (1418a; 1518a) having a first side and a second side opposite the first side, the base including a plurality of corrugations (1422a; 1522a); a first susceptor layer (1402a; 1502a) joined to the base, the first susceptor layer (1402a; 1502a) is disposed on the first side of the base (1418a; 1518b), the first susceptor layer having a substantially planar configuration, so that the first susceptor layer extends across the plurality of corrugations; and a second susceptor layer (1402b; 1502b) joined to the base, the second susceptor layer (1402b; 1502b) is disposed on the second side of the base (1418a; 1518b), the second susceptor layer having a substantially planar configuration, so that the second susceptor layer extends across the plurality of corrugations, wherein the construct including the first susceptor layer and the second susceptor layer is for underlying a food item having a lower surface that is desirably at least one of browned and crisped, wherein at least one of the first susceptor layer and the second susceptor layer includes a central region including a microwave energy transparent area (1404; 1504) circumscribed by the respective susceptor layer, at least one of the first susceptor layer and the second susceptor layer includes a peripheral region extending around the central region, the peripheral region including a microwave energy transparent area circumscribed by the respective susceptor layer. at least one of the first susceptor layer and the second susceptor layer includes a central region including a microwave energy transparent area (1404; 1504) circumscribed by the respective susceptor layer, at least one of the first susceptor layer and the second susceptor layer includes a peripheral region extending around the central region, the peripheral region including a microwave energy transparent area circumscribed by the respective susceptor layer.